refactor(hooks): use provider_models mapping for image analysis

Changes ImageAnalysisConfig from providers array to provider_models
mapping for granular vision model control per CLIProxy provider.

Breaking change: config.yaml image_analysis section now uses
provider_models instead of providers/model fields.

Provider-to-model mappings:
- agy → gemini-2.5-flash
- gemini → gemini-2.5-flash
- codex → gpt-5.1-codex-mini
- kiro → kiro-claude-haiku-4-5
- ghcp → claude-haiku-4.5
- claude → claude-haiku-4-5-20251001

Hook checks CCS_CURRENT_PROVIDER against provider_models and skips
if no vision model configured for that provider.

src/utils/hooks/get-image-analysis-hook-env.ts

@@ -9,25 +9,34 @@
 
 import { getImageAnalysisConfig } from '../../config/unified-config-loader';
 
+/**
+ * Serialize provider_models map to env var format: provider:model,provider:model
+ */
+function serializeProviderModels(providerModels: Record<string, string>): string {
+  return Object.entries(providerModels)
+    .map(([provider, model]) => `${provider}:${model}`)
+    .join(',');
+}
+
 /**
  * Get image analysis hook environment variables.
  * These env vars control the hook's behavior via Claude Code hook system.
  *
- * @param profileName - Current profile name (to determine if native Claude)
+ * @param provider - Current CLIProxy provider (e.g., 'agy', 'gemini', 'codex')
  * @returns Environment variables for image analysis hook
  */
-export function getImageAnalysisHookEnv(profileName?: string): Record<string, string> {
+export function getImageAnalysisHookEnv(provider?: string): Record<string, string> {
   const config = getImageAnalysisConfig();
 
-  // Native Claude profiles (no CLIProxy) should skip image analysis
-  const isNativeProfile = !profileName || ['claude', 'anthropic'].includes(profileName);
-  const skipImageAnalysis = isNativeProfile || !config.enabled;
+  // Check if current provider has a vision model configured
+  const hasVisionModel = provider && config.provider_models[provider];
+  const skipImageAnalysis = !config.enabled || !hasVisionModel;
 
   return {
     CCS_IMAGE_ANALYSIS_ENABLED: config.enabled ? '1' : '0',
-    CCS_IMAGE_ANALYSIS_MODEL: config.model || 'gemini-2.5-flash',
     CCS_IMAGE_ANALYSIS_TIMEOUT: String(Number(config.timeout) || 60),
-    CCS_IMAGE_ANALYSIS_PROVIDERS: config.providers.join(','),
+    CCS_IMAGE_ANALYSIS_PROVIDER_MODELS: serializeProviderModels(config.provider_models),
+    CCS_CURRENT_PROVIDER: provider || '',
     CCS_IMAGE_ANALYSIS_SKIP: skipImageAnalysis ? '1' : '0',
   };
 }