feat(cliproxy): add CLIProxyAPI integration for OAuth profiles

Complete integration of CLIProxyAPI for zero-config OAuth profiles.

New profiles:
- ccs gemini: Gemini via OAuth
- ccs chatgpt: ChatGPT via OAuth
- ccs qwen: Qwen via OAuth

Implementation:
- Phase 1: Binary infrastructure (download-on-demand)
- Phase 2: Proxy executor (spawn/kill pattern)
- Phase 3: OAuth integration (browser-based auth)
- Phase 4: Profile registration (routing + help text)
- Phase 5: Diagnostics (doctor command + errors)

Files added:
- src/cliproxy/*.ts (binary-manager, platform-detector, executor, auth-handler, config-generator, types, index)

Files modified:
- src/ccs.ts (CLIProxy routing)
- src/auth/profile-detector.ts (cliproxy profile type)
- src/commands/help-command.ts (new profiles in help)
- src/management/doctor.ts (CLIProxy health checks)
- src/utils/error-manager.ts (OAuth/port/download errors)
- CHANGELOG.md (v5.0.0 release notes)

Tests: 42/42 passed

src/cliproxy/index.ts

@@ -0,0 +1,73 @@
+/**
+ * CLIProxy Module Exports
+ * Central export point for CLIProxyAPI binary management and execution
+ */
+
+// Types
+export type {
+  PlatformInfo,
+  SupportedOS,
+  SupportedArch,
+  ArchiveExtension,
+  BinaryManagerConfig,
+  BinaryInfo,
+  DownloadProgress,
+  ProgressCallback,
+  ChecksumResult,
+  DownloadResult,
+  CLIProxyProvider,
+  CLIProxyConfig,
+  ExecutorConfig,
+  ProviderConfig,
+  ProviderModelMapping,
+} from './types';
+
+// Platform detection
+export {
+  detectPlatform,
+  getDownloadUrl,
+  getChecksumsUrl,
+  getExecutableName,
+  isPlatformSupported,
+  getPlatformDescription,
+  CLIPROXY_VERSION,
+} from './platform-detector';
+
+// Binary management
+export {
+  BinaryManager,
+  ensureCLIProxyBinary,
+  isCLIProxyInstalled,
+  getCLIProxyPath,
+} from './binary-manager';
+
+// Config generation
+export {
+  generateConfig,
+  getClaudeEnvVars,
+  getProviderConfig,
+  getModelMapping,
+  getAuthDir,
+  getConfigPath,
+  configExists,
+  deleteConfig,
+  PROVIDER_CONFIGS,
+  CLIPROXY_DEFAULT_PORT,
+} from './config-generator';
+
+// Executor
+export { execClaudeWithCLIProxy, isPortAvailable, findAvailablePort } from './cliproxy-executor';
+
+// Authentication
+export type { AuthStatus } from './auth-handler';
+export {
+  isAuthenticated,
+  getAuthStatus,
+  getAllAuthStatus,
+  clearAuth,
+  triggerOAuth,
+  ensureAuth,
+  getOAuthConfig,
+  getProviderTokenDir,
+  displayAuthStatus,
+} from './auth-handler';