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/utils/hooks/image-analysis-backend-resolver.ts

@@ -8,7 +8,7 @@ import {
   mapExternalProviderName,
 } from '../../cliproxy/provider-capabilities';
 import { getProviderCatalog, supportsNativeImageInput } from '../../cliproxy/model-catalog';
-import { extractProviderFromPathname } from '../../cliproxy/model-id-normalizer';
+import { extractProviderFromPathname } from '../../cliproxy/ai-providers/model-id-normalizer';
 import type { CliproxyBridgeMetadata } from '../../api/services/profile-types';
 import type { Settings } from '../../types/config';
 import type { ProfileType } from '../../types/profile';