feat: add dynamic model discovery and routing for OpenCode provider

- Update isOpencodeModel() to detect dynamic models with provider/model format
  (e.g., github-copilot/gpt-4o, google/gemini-2.5-pro, zai-coding-plan/glm-4.7)
- Update resolveModelString() to recognize and pass through OpenCode models
- Update enhance route to route OpenCode models to OpenCode provider
- Fix OpenCode CLI command format: use --format json (not stream-json)
- Remove unsupported -q and - flags from CLI arguments
- Update normalizeEvent() to handle actual OpenCode JSON event format
- Add dynamic model configuration UI with provider grouping
- Cache providers and models in app store for snappier navigation
- Show authenticated providers in OpenCode CLI status card

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

apps/ui/src/lib/http-api-client.ts

@@ -1440,6 +1440,67 @@ export class HttpApiClient implements ElectronAPI {
       error?: string;
     }> => this.get('/api/setup/opencode-status'),
 
+    // OpenCode Dynamic Model Discovery
+    getOpencodeModels: (
+      refresh?: boolean
+    ): Promise<{
+      success: boolean;
+      models?: Array<{
+        id: string;
+        name: string;
+        modelString: string;
+        provider: string;
+        description: string;
+        supportsTools: boolean;
+        supportsVision: boolean;
+        tier: string;
+        default?: boolean;
+      }>;
+      count?: number;
+      cached?: boolean;
+      error?: string;
+    }> => this.get(`/api/setup/opencode/models${refresh ? '?refresh=true' : ''}`),
+
+    refreshOpencodeModels: (): Promise<{
+      success: boolean;
+      models?: Array<{
+        id: string;
+        name: string;
+        modelString: string;
+        provider: string;
+        description: string;
+        supportsTools: boolean;
+        supportsVision: boolean;
+        tier: string;
+        default?: boolean;
+      }>;
+      count?: number;
+      error?: string;
+    }> => this.post('/api/setup/opencode/models/refresh'),
+
+    getOpencodeProviders: (): Promise<{
+      success: boolean;
+      providers?: Array<{
+        id: string;
+        name: string;
+        authenticated: boolean;
+        authMethod?: 'oauth' | 'api_key';
+      }>;
+      authenticated?: Array<{
+        id: string;
+        name: string;
+        authenticated: boolean;
+        authMethod?: 'oauth' | 'api_key';
+      }>;
+      error?: string;
+    }> => this.get('/api/setup/opencode/providers'),
+
+    clearOpencodeCache: (): Promise<{
+      success: boolean;
+      message?: string;
+      error?: string;
+    }> => this.post('/api/setup/opencode/cache/clear'),
+
     onInstallProgress: (callback: (progress: unknown) => void) => {
       return this.subscribeToEvent('agent:stream', callback);
     },