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

tests/unit/utils/hooks/image-analysis-runtime-status-circular-dependency.test.ts

@@ -2,7 +2,7 @@ import { describe, expect, it } from 'bun:test';
 import { readFileSync } from 'fs';
 import { dirname } from 'path';
 import type { ImageAnalysisStatus } from '../../../../src/utils/hooks/image-analysis-backend-resolver';
-import type { AuthStatus } from '../../../../src/cliproxy/auth-handler';
+import type { AuthStatus } from '../../../../src/cliproxy/auth/auth-handler';
 import {
   ModuleKind,
   ScriptTarget,
@@ -67,14 +67,14 @@ describe('image-analysis-runtime-status circular dependency regression', () => {
 
     const module = { exports: {} as Record<string, unknown> };
     const requireMap: Record<string, unknown> = {
-      '../../cliproxy/auth-handler': authHandlerModule,
-      '../../cliproxy/remote-proxy-client': {
+      '../../cliproxy/auth/auth-handler': authHandlerModule,
+      '../../cliproxy/services/remote-proxy-client': {
         checkRemoteProxy: async () => ({ reachable: false, error: 'not-used' }),
       },
-      '../../cliproxy/remote-auth-fetcher': {
+      '../../cliproxy/services/remote-auth-fetcher': {
         fetchRemoteAuthStatus: async () => [],
       },
-      '../../cliproxy/proxy-target-resolver': {
+      '../../cliproxy/proxy/proxy-target-resolver': {
         getProxyTarget: () => ({
           host: '127.0.0.1',
           port: 8317,
@@ -86,7 +86,7 @@ describe('image-analysis-runtime-status circular dependency regression', () => {
         getProviderDisplayName: () => 'GitHub Copilot (OAuth)',
         isCLIProxyProvider: () => true,
       },
-      '../../cliproxy/stats-fetcher': {
+      '../../cliproxy/services/stats-fetcher': {
         isCliproxyRunning: async () => true,
       },
       '../../config/unified-config-types': {