feat: Add source code viewer with Gitea integration

- Add /source page with file explorer and code viewer
- Connect to Gitea API for repository browsing
- Implement MCP tools: get_repo_info, list_repo_files, read_repo_file, search_repo_code
- Default to nucleo000/agent-ui repository
- Support branch switching and file search

frontend/src/services/toolRegistry.ts

@@ -29,8 +29,13 @@ import {
   unregisterDatabaseTools,
   DATABASE_TOOLS
 } from './tools/databaseTools'
+import {
+  registerSourceCodeTools,
+  unregisterSourceCodeTools,
+  SOURCE_CODE_TOOLS
+} from './tools/sourceCodeTools'
 
-type PageName = 'home' | 'canvas' | 'components' | 'themes' | 'projects' | 'project-canvas' | 'database'
+type PageName = 'home' | 'canvas' | 'components' | 'themes' | 'projects' | 'project-canvas' | 'database' | 'source'
 
 interface PageToolSet {
   register: () => void
@@ -95,6 +100,11 @@ const pageTools: Record<PageName, PageToolSet> = {
     register: registerDatabaseTools,
     unregister: unregisterDatabaseTools,
     toolNames: DATABASE_TOOLS
+  },
+  source: {
+    register: registerSourceCodeTools,
+    unregister: unregisterSourceCodeTools,
+    toolNames: SOURCE_CODE_TOOLS
   }
 }