refactor(cliproxy): flatten module structure and colocate tests (#1135)

- Split types.ts (331 LOC) into 4 concern-based files under types/:
  platform-types, binary-types, provider-types, config-types
- Preserve backward compat via barrel re-export (types.ts → types/index)
- Reorganize 53 root-level files into 8 subdirectories:
  accounts/, ai-providers/, auth/, binary/, config/, executor/,
  management/, proxy/, quota/, routing/, services/, sync/
- Reduce src/cliproxy/ root from 65 to 8 files (target: ≤10)
- Colocate 87 unit tests from tests/unit/cliproxy/ into
  src/cliproxy/*/__tests__/ (13 colocated test directories)
- Update import paths across 40+ consumer files
- Add TDD backward-compat test for types split

Refs #1135

src/api/services/cliproxy-profile-bridge.ts

@@ -1,16 +1,16 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import { getCcsDir, loadConfigSafe } from '../../utils/config-manager';
-import { buildProxyUrl, getProxyTarget } from '../../cliproxy/proxy-target-resolver';
-import { getEffectiveApiKey } from '../../cliproxy/auth-token-manager';
-import { getModelMappingFromConfig } from '../../cliproxy/base-config-loader';
+import { buildProxyUrl, getProxyTarget } from '../../cliproxy/proxy/proxy-target-resolver';
+import { getEffectiveApiKey } from '../../cliproxy/auth/auth-token-manager';
+import { getModelMappingFromConfig } from '../../cliproxy/config/base-config-loader';
 import {
   CLIPROXY_PROVIDER_IDS,
   getProviderDescription,
   getProviderDisplayName,
   mapExternalProviderName,
 } from '../../cliproxy/provider-capabilities';
-import { extractProviderFromPathname } from '../../cliproxy/model-id-normalizer';
+import { extractProviderFromPathname } from '../../cliproxy/ai-providers/model-id-normalizer';
 import { isUnifiedMode, loadOrCreateUnifiedConfig } from '../../config/unified-config-loader';
 import type { TargetType } from '../../targets/target-adapter';
 import type { Settings } from '../../types/config';

src/api/services/profile-lifecycle-validation.ts

@@ -7,7 +7,7 @@
 import {
   extractProviderFromPathname,
   getDeniedModelIdReasonForProvider,
-} from '../../cliproxy/model-id-normalizer';
+} from '../../cliproxy/ai-providers/model-id-normalizer';
 import { mapExternalProviderName } from '../../cliproxy/provider-capabilities';
 import type { CLIProxyProvider } from '../../cliproxy/types';
 import type { ProfileValidationIssue, ProfileValidationSummary } from './profile-types';

src/api/services/profile-writer.ts

@@ -17,7 +17,7 @@ import { mapExternalProviderName } from '../../cliproxy/provider-capabilities';
 import {
   extractProviderFromPathname,
   getDeniedModelIdReasonForProvider,
-} from '../../cliproxy/model-id-normalizer';
+} from '../../cliproxy/ai-providers/model-id-normalizer';
 import type { CLIProxyProvider } from '../../cliproxy/types';
 import type {
   ModelMapping,