fix: separate type-only exports and migrate test imports from dist/ to src/

Spinner interface re-exported as value in checks/index.ts caused Bun
runtime crash. Test files importing from dist/ failed without build step.

src/management/checks/index.ts

@@ -3,16 +3,16 @@
  */
 
 // Types and utilities
-export {
-  HealthCheck,
+export type {
   HealthCheckDetails,
   HealthCheckItem,
   HealthIssue,
-  IHealthChecker,
   Spinner,
-  createSpinner,
+  IHealthChecker,
 } from './types';
 
+export { HealthCheck, createSpinner } from './types';
+
 // System checks
 export { ClaudeCliChecker, CcsDirectoryChecker, runSystemChecks } from './system-check';
 

tests/unit/cliproxy/port-validation.test.ts

@@ -15,8 +15,8 @@ import { describe, it, expect } from 'bun:test';
 import {
   validatePort,
   CLIPROXY_DEFAULT_PORT,
-} from '../../../dist/cliproxy/config-generator';
-import { resolveProxyConfig } from '../../../dist/cliproxy/proxy-config-resolver';
+} from '../../../src/cliproxy/config-generator';
+import { resolveProxyConfig } from '../../../src/cliproxy/proxy-config-resolver';
 
 describe('Port Validation', () => {
   describe('validatePort()', () => {

tests/unit/cliproxy/proxy-detector-port.test.ts

@@ -6,8 +6,8 @@
  */
 
 import { describe, it, expect } from 'bun:test';
-import { detectRunningProxy } from '../../../dist/cliproxy/proxy-detector';
-import { CLIPROXY_DEFAULT_PORT } from '../../../dist/cliproxy/config-generator';
+import { detectRunningProxy } from '../../../src/cliproxy/proxy-detector';
+import { CLIPROXY_DEFAULT_PORT } from '../../../src/cliproxy/config-generator';
 
 describe('Proxy Detector Port Validation', () => {
   describe('detectRunningProxy with invalid ports', () => {

tests/unit/cliproxy/schema-sanitizer.test.ts

@@ -6,7 +6,7 @@
  */
 
 import { describe, expect, test } from 'bun:test';
-import { sanitizeInputSchema, sanitizeToolSchemas } from '../../../dist/cliproxy/schema-sanitizer.js';
+import { sanitizeInputSchema, sanitizeToolSchemas } from '../../../src/cliproxy/schema-sanitizer';
 
 describe('sanitizeInputSchema', () => {
   test('preserves Gemini-supported properties', () => {