diff --git a/.github/workflows/deploy-ccs-worker.yml b/.github/workflows/deploy-ccs-worker.yml
index 6391e91f..d08900c4 100644
--- a/.github/workflows/deploy-ccs-worker.yml
+++ b/.github/workflows/deploy-ccs-worker.yml
@@ -8,9 +8,13 @@ on:
       - 'scripts/wrangler.toml'
       - 'installers/**'
 
-  # Run on all PRs to satisfy branch protection (no path filter)
+  # Only run on PRs that touch installer-related files
   pull_request:
     branches: [main]
+    paths:
+      - 'scripts/worker.js'
+      - 'scripts/wrangler.toml'
+      - 'installers/**'
 
   # Allow manual trigger
   workflow_dispatch:
diff --git a/VERSION b/VERSION
index 1bc788d3..0305f287 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.6.0
+5.6.0-dev.3
diff --git a/config/base-iflow.settings.json b/config/base-iflow.settings.json
new file mode 100644
index 00000000..2fc56b47
--- /dev/null
+++ b/config/base-iflow.settings.json
@@ -0,0 +1,10 @@
+{
+  "env": {
+    "ANTHROPIC_BASE_URL": "http://127.0.0.1:8317/api/provider/iflow",
+    "ANTHROPIC_AUTH_TOKEN": "ccs-internal-managed",
+    "ANTHROPIC_MODEL": "deepseek-v3.2",
+    "ANTHROPIC_DEFAULT_OPUS_MODEL": "kimi-k2-thinking",
+    "ANTHROPIC_DEFAULT_SONNET_MODEL": "deepseek-v3.2",
+    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "minimax-m2"
+  }
+}
diff --git a/config/base-qwen.settings.json b/config/base-qwen.settings.json
index 03b3e36c..03c510ca 100644
--- a/config/base-qwen.settings.json
+++ b/config/base-qwen.settings.json
@@ -2,9 +2,9 @@
   "env": {
     "ANTHROPIC_BASE_URL": "http://127.0.0.1:8317/api/provider/qwen",
     "ANTHROPIC_AUTH_TOKEN": "ccs-internal-managed",
-    "ANTHROPIC_MODEL": "qwen3-coder",
-    "ANTHROPIC_DEFAULT_OPUS_MODEL": "qwen3-coder",
-    "ANTHROPIC_DEFAULT_SONNET_MODEL": "qwen3-coder",
-    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "qwen3-coder"
+    "ANTHROPIC_MODEL": "qwen3-coder-plus",
+    "ANTHROPIC_DEFAULT_OPUS_MODEL": "qwen3-coder-plus",
+    "ANTHROPIC_DEFAULT_SONNET_MODEL": "qwen3-coder-plus",
+    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "qwen3-vl-plus"
   }
 }
diff --git a/package.json b/package.json
index ad99505d..b432e6a0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kaitranntt/ccs",
-  "version": "5.6.0",
+  "version": "5.6.0-dev.3",
   "description": "Claude Code Switch - Instant profile switching between Claude Sonnet 4.5 and GLM 4.6",
   "keywords": [
     "cli",
diff --git a/src/ccs.ts b/src/ccs.ts
index eb6f2d11..ff210f8f 100644
--- a/src/ccs.ts
+++ b/src/ccs.ts
@@ -228,7 +228,8 @@ async function main(): Promise<void> {
 
   // Special case: doctor command
   if (firstArg === 'doctor' || firstArg === '--doctor') {
-    await handleDoctorCommand();
+    const shouldFix = args.includes('--fix') || args.includes('-f');
+    await handleDoctorCommand(shouldFix);
     return;
   }
 
diff --git a/src/cliproxy/auth-handler.ts b/src/cliproxy/auth-handler.ts
index 4a192c33..311ad428 100644
--- a/src/cliproxy/auth-handler.ts
+++ b/src/cliproxy/auth-handler.ts
@@ -12,12 +12,12 @@
  * Each provider has its own directory to avoid conflicts.
  */
 
+import { execSync, spawn } from 'child_process';
 import * as fs from 'fs';
 import * as path from 'path';
-import { spawn, execSync } from 'child_process';
 import { ProgressIndicator } from '../utils/progress-indicator';
-import { getProviderAuthDir, generateConfig } from './config-generator';
 import { ensureCLIProxyBinary } from './binary-manager';
+import { generateConfig, getProviderAuthDir } from './config-generator';
 import { CLIProxyProvider } from './types';
 
 /**
@@ -169,6 +169,13 @@ const OAUTH_CONFIGS: Record<CLIProxyProvider, ProviderOAuthConfig> = {
     scopes: ['openid', 'profile', 'email', 'model.completion'],
     authFlag: '--qwen-login',
   },
+  iflow: {
+    provider: 'iflow',
+    displayName: 'iFlow',
+    authUrl: 'https://iflow.cn/oauth',
+    scopes: ['phone', 'profile', 'email'],
+    authFlag: '--iflow-login',
+  },
 };
 
 /**
@@ -199,6 +206,7 @@ const PROVIDER_AUTH_PREFIXES: Record<CLIProxyProvider, string[]> = {
   codex: ['codex-', 'openai-'],
   agy: ['antigravity-', 'agy-'],
   qwen: ['qwen-'],
+  iflow: ['iflow-'],
 };
 
 /**
@@ -210,6 +218,7 @@ const PROVIDER_TYPE_VALUES: Record<CLIProxyProvider, string[]> = {
   codex: ['codex'],
   agy: ['antigravity'],
   qwen: ['qwen'],
+  iflow: ['iflow'],
 };
 
 /**
@@ -327,7 +336,7 @@ export function getAuthStatus(provider: CLIProxyProvider): AuthStatus {
  * Get auth status for all providers
  */
 export function getAllAuthStatus(): AuthStatus[] {
-  const providers: CLIProxyProvider[] = ['gemini', 'codex', 'agy', 'qwen'];
+  const providers: CLIProxyProvider[] = ['gemini', 'codex', 'agy', 'qwen', 'iflow'];
   return providers.map(getAuthStatus);
 }
 
diff --git a/src/cliproxy/config-generator.ts b/src/cliproxy/config-generator.ts
index 9c6cde6c..c267bc29 100644
--- a/src/cliproxy/config-generator.ts
+++ b/src/cliproxy/config-generator.ts
@@ -12,7 +12,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import { getCcsDir } from '../utils/config-manager';
 import { CLIProxyProvider, ProviderConfig, ProviderModelMapping } from './types';
-import { getModelMappingFromConfig } from './base-config-loader';
+import { getModelMappingFromConfig, getEnvVarsFromConfig } from './base-config-loader';
 
 /** Settings file structure for user overrides */
 interface ProviderSettings {
@@ -31,6 +31,7 @@ const PROVIDER_DISPLAY_NAMES: Record<CLIProxyProvider, string> = {
   codex: 'Codex',
   agy: 'Antigravity',
   qwen: 'Qwen Code',
+  iflow: 'iFlow',
 };
 
 /**
@@ -197,7 +198,11 @@ export function getClaudeEnvVars(
 ): NodeJS.ProcessEnv {
   const models = getModelMapping(provider);
 
-  return {
+  // Base env vars from config file (includes ANTHROPIC_MAX_TOKENS, etc.)
+  const baseEnvVars = getEnvVarsFromConfig(provider);
+
+  // Core env vars that we always set dynamically
+  const coreEnvVars = {
     // Provider-specific endpoint - routes to correct provider via URL path
     ANTHROPIC_BASE_URL: `http://127.0.0.1:${port}/api/provider/${provider}`,
     ANTHROPIC_AUTH_TOKEN: CCS_INTERNAL_API_KEY,
@@ -206,6 +211,23 @@ export function getClaudeEnvVars(
     ANTHROPIC_DEFAULT_SONNET_MODEL: models.sonnetModel || models.claudeModel,
     ANTHROPIC_DEFAULT_HAIKU_MODEL: models.haikuModel || models.claudeModel,
   };
+
+  // Filter out core env vars from base config to avoid conflicts
+  const {
+    ANTHROPIC_BASE_URL: _baseUrl,
+    ANTHROPIC_AUTH_TOKEN: _authToken,
+    ANTHROPIC_MODEL: _model,
+    ANTHROPIC_DEFAULT_OPUS_MODEL: _opusModel,
+    ANTHROPIC_DEFAULT_SONNET_MODEL: _sonnetModel,
+    ANTHROPIC_DEFAULT_HAIKU_MODEL: _haikuModel,
+    ...additionalEnvVars
+  } = baseEnvVars;
+
+  // Merge core env vars with additional env vars from base config
+  return {
+    ...coreEnvVars,
+    ...additionalEnvVars, // Includes ANTHROPIC_MAX_TOKENS, etc.
+  };
 }
 
 /**
diff --git a/src/cliproxy/types.ts b/src/cliproxy/types.ts
index a9ae85a7..925842d0 100644
--- a/src/cliproxy/types.ts
+++ b/src/cliproxy/types.ts
@@ -47,7 +47,7 @@ export interface BinaryManagerConfig {
   /** Enable verbose logging */
   verbose: boolean;
   /** Force specific version (skip auto-upgrade to latest) */
-  forceVersion?: boolean;
+  forceVersion: boolean;
 }
 
 /**
@@ -113,8 +113,9 @@ export interface DownloadResult {
  * - codex: OpenAI Codex via OAuth
  * - agy: Antigravity via OAuth (short name for easy usage)
  * - qwen: Qwen Code via OAuth (qwen3-coder)
+ * - iflow: iFlow via OAuth
  */
-export type CLIProxyProvider = 'gemini' | 'codex' | 'agy' | 'qwen';
+export type CLIProxyProvider = 'gemini' | 'codex' | 'agy' | 'qwen' | 'iflow';
 
 /**
  * CLIProxy config.yaml structure (minimal)
diff --git a/src/commands/doctor-command.ts b/src/commands/doctor-command.ts
index 5d5ff175..6f4c7c65 100644
--- a/src/commands/doctor-command.ts
+++ b/src/commands/doctor-command.ts
@@ -6,14 +6,20 @@
 
 /**
  * Handle doctor command
+ * @param shouldFix - If true, attempt to fix detected issues
  */
-export async function handleDoctorCommand(): Promise<void> {
+export async function handleDoctorCommand(shouldFix = false): Promise<void> {
   const DoctorModule = await import('../management/doctor');
   const Doctor = DoctorModule.default;
   const doctor = new Doctor();
 
   await doctor.runAllChecks();
 
+  // Attempt to fix issues if --fix flag provided
+  if (shouldFix) {
+    await doctor.fixIssues();
+  }
+
   // Exit with error code if unhealthy
   process.exit(doctor.isHealthy() ? 0 : 1);
 }
diff --git a/src/commands/sync-command.ts b/src/commands/sync-command.ts
index 33244096..bb2c60c0 100644
--- a/src/commands/sync-command.ts
+++ b/src/commands/sync-command.ts
@@ -31,6 +31,15 @@ export async function handleSyncCommand(): Promise<void> {
   const manager = new ClaudeSymlinkManager();
   manager.install(false);
 
+  console.log('');
+
+  // Repair shared symlinks (~/.ccs/shared/ → ~/.claude/)
+  // This fixes symlinks broken by Claude CLI's atomic writes (e.g., toggle thinking)
+  const SharedManager = (await import('../management/shared-manager')).default;
+  const sharedManager = new SharedManager();
+  sharedManager.ensureSharedDirectories();
+  console.log(colored('[OK]', 'green') + ' Shared symlinks verified');
+
   console.log('');
   console.log(colored('[OK] Sync complete!', 'green'));
   console.log('');
diff --git a/src/management/doctor.ts b/src/management/doctor.ts
index af25862a..3dfaee1b 100644
--- a/src/management/doctor.ts
+++ b/src/management/doctor.ts
@@ -955,6 +955,49 @@ class Doctor {
     );
   }
 
+  /**
+   * Fix detected issues
+   * Currently fixes: shared symlinks broken by Claude CLI's atomic writes
+   */
+  async fixIssues(): Promise<void> {
+    console.log('');
+    console.log(header('ATTEMPTING FIXES'));
+    console.log('');
+
+    let fixed = 0;
+
+    // Fix shared symlinks (settings.json broken by Claude CLI toggle thinking, etc.)
+    const sharedSettings = path.join(this.homedir, '.ccs', 'shared', 'settings.json');
+    if (fs.existsSync(sharedSettings)) {
+      try {
+        const stats = fs.lstatSync(sharedSettings);
+        if (!stats.isSymbolicLink()) {
+          const spinner = ora('Fixing shared settings.json symlink').start();
+          try {
+            // Import and use SharedManager to fix symlinks
+            const SharedManagerModule = await import('./shared-manager');
+            const SharedManager = SharedManagerModule.default;
+            const sharedManager = new SharedManager();
+            sharedManager.ensureSharedDirectories();
+            spinner.succeed(ok('Fixed') + ' Shared settings.json symlink restored');
+            fixed++;
+          } catch (err) {
+            spinner.fail(fail('Failed') + ` Could not fix: ${(err as Error).message}`);
+          }
+        }
+      } catch (_err) {
+        // Ignore stat errors
+      }
+    }
+
+    if (fixed > 0) {
+      console.log('');
+      console.log(ok(`[OK] Fixed ${fixed} issue(s)`));
+    } else {
+      console.log(info('[i] No fixable issues detected'));
+    }
+  }
+
   /**
    * Check if the health check results are healthy
    */