feat: Add unified LiteLLM API management with dashboard UI and CLI integration

- Create ccw-litellm Python package with AbstractEmbedder and AbstractLLMClient interfaces
- Add BaseEmbedder abstraction and factory pattern to codex-lens for pluggable backends
- Implement API Settings dashboard page for provider credentials and custom endpoints
- Add REST API routes for CRUD operations on providers and endpoints
- Extend CLI with --model parameter for custom endpoint routing
- Integrate existing context-cache for @pattern file resolution
- Add provider model registry with predefined models per provider type
- Include i18n translations (en/zh) for all new UI elements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ccw/src/core/dashboard-generator.ts

@@ -46,7 +46,8 @@ const MODULE_CSS_FILES = [
   '27-graph-explorer.css',
   '28-mcp-manager.css',
   '29-help.css',
-  '30-core-memory.css'
+  '30-core-memory.css',
+  '31-api-settings.css'
 ];
 
 const MODULE_FILES = [
@@ -95,6 +96,7 @@ const MODULE_FILES = [
   'views/skills-manager.js',
   'views/rules-manager.js',
   'views/claude-manager.js',
+  'views/api-settings.js',
   'views/help.js',
   'main.js'
 ];