feat: update Codex services and UI components for enhanced model management

- Bumped version numbers for @automaker/server and @automaker/ui to 0.9.0 in package-lock.json.
- Introduced CodexAppServerService and CodexModelCacheService to manage communication with the Codex CLI's app-server and cache model data.
- Updated CodexUsageService to utilize app-server for fetching usage data.
- Enhanced Codex routes to support fetching available models and integrated model caching.
- Improved UI components to dynamically load and display Codex models, including error handling and loading states.
- Added new API methods for fetching Codex models and integrated them into the app store for state management.

These changes improve the overall functionality and user experience of the Codex integration, ensuring efficient model management and data retrieval.

apps/server/src/services/codex-app-server-service.ts

@@ -0,0 +1,212 @@
+import { spawn, type ChildProcess } from 'child_process';
+import readline from 'readline';
+import { findCodexCliPath } from '@automaker/platform';
+import { createLogger } from '@automaker/utils';
+import type {
+  AppServerModelResponse,
+  AppServerAccountResponse,
+  AppServerRateLimitsResponse,
+  JsonRpcRequest,
+} from '@automaker/types';
+
+const logger = createLogger('CodexAppServer');
+
+/**
+ * CodexAppServerService
+ *
+ * Centralized service for communicating with Codex CLI's app-server via JSON-RPC protocol.
+ * Handles process spawning, JSON-RPC messaging, and cleanup.
+ *
+ * Connection strategy: Spawn on-demand (new process for each method call)
+ */
+export class CodexAppServerService {
+  private cachedCliPath: string | null = null;
+
+  /**
+   * Check if Codex CLI is available on the system
+   */
+  async isAvailable(): Promise<boolean> {
+    this.cachedCliPath = await findCodexCliPath();
+    return Boolean(this.cachedCliPath);
+  }
+
+  /**
+   * Fetch available models from app-server
+   */
+  async getModels(): Promise<AppServerModelResponse | null> {
+    const result = await this.executeJsonRpc<AppServerModelResponse>((sendRequest) => {
+      return sendRequest('model/list', {});
+    });
+
+    if (result) {
+      logger.info(`[getModels] ✓ Fetched ${result.data.length} models`);
+    }
+
+    return result;
+  }
+
+  /**
+   * Fetch account information from app-server
+   */
+  async getAccount(): Promise<AppServerAccountResponse | null> {
+    return this.executeJsonRpc<AppServerAccountResponse>((sendRequest) => {
+      return sendRequest('account/read', { refreshToken: false });
+    });
+  }
+
+  /**
+   * Fetch rate limits from app-server
+   */
+  async getRateLimits(): Promise<AppServerRateLimitsResponse | null> {
+    return this.executeJsonRpc<AppServerRateLimitsResponse>((sendRequest) => {
+      return sendRequest('account/rateLimits/read', {});
+    });
+  }
+
+  /**
+   * Execute JSON-RPC requests via Codex app-server
+   *
+   * This method:
+   * 1. Spawns a new `codex app-server` process
+   * 2. Handles JSON-RPC initialization handshake
+   * 3. Executes user-provided requests
+   * 4. Cleans up the process
+   *
+   * @param requestFn - Function that receives sendRequest helper and returns a promise
+   * @returns Result of the JSON-RPC request or null on failure
+   */
+  private async executeJsonRpc<T>(
+    requestFn: (sendRequest: <R>(method: string, params?: unknown) => Promise<R>) => Promise<T>
+  ): Promise<T | null> {
+    let childProcess: ChildProcess | null = null;
+
+    try {
+      const cliPath = this.cachedCliPath || (await findCodexCliPath());
+
+      if (!cliPath) {
+        return null;
+      }
+
+      // On Windows, .cmd files must be run through shell
+      const needsShell = process.platform === 'win32' && cliPath.toLowerCase().endsWith('.cmd');
+
+      childProcess = spawn(cliPath, ['app-server'], {
+        cwd: process.cwd(),
+        env: {
+          ...process.env,
+          TERM: 'dumb',
+        },
+        stdio: ['pipe', 'pipe', 'pipe'],
+        shell: needsShell,
+      });
+
+      if (!childProcess.stdin || !childProcess.stdout) {
+        throw new Error('Failed to create stdio pipes');
+      }
+
+      // Setup readline for reading JSONL responses
+      const rl = readline.createInterface({
+        input: childProcess.stdout,
+        crlfDelay: Infinity,
+      });
+
+      // Message ID counter for JSON-RPC
+      let messageId = 0;
+      const pendingRequests = new Map<
+        number,
+        {
+          resolve: (value: unknown) => void;
+          reject: (error: Error) => void;
+          timeout: NodeJS.Timeout;
+        }
+      >();
+
+      // Process incoming messages
+      rl.on('line', (line) => {
+        if (!line.trim()) return;
+
+        try {
+          const message = JSON.parse(line);
+
+          // Handle response to our request
+          if ('id' in message && message.id !== undefined) {
+            const pending = pendingRequests.get(message.id);
+            if (pending) {
+              clearTimeout(pending.timeout);
+              pendingRequests.delete(message.id);
+              if (message.error) {
+                pending.reject(new Error(message.error.message || 'Unknown error'));
+              } else {
+                pending.resolve(message.result);
+              }
+            }
+          }
+          // Ignore notifications (no id field)
+        } catch {
+          // Ignore parse errors for non-JSON lines
+        }
+      });
+
+      // Helper to send JSON-RPC request and wait for response
+      const sendRequest = <R>(method: string, params?: unknown): Promise<R> => {
+        return new Promise((resolve, reject) => {
+          const id = ++messageId;
+          const request: JsonRpcRequest = {
+            method,
+            id,
+            params: params ?? {},
+          };
+
+          // Set timeout for request (10 seconds)
+          const timeout = setTimeout(() => {
+            pendingRequests.delete(id);
+            reject(new Error(`Request timeout: ${method}`));
+          }, 10000);
+
+          pendingRequests.set(id, {
+            resolve: resolve as (value: unknown) => void,
+            reject,
+            timeout,
+          });
+
+          childProcess!.stdin!.write(JSON.stringify(request) + '\n');
+        });
+      };
+
+      // Helper to send notification (no response expected)
+      const sendNotification = (method: string, params?: unknown): void => {
+        const notification = params ? { method, params } : { method };
+        childProcess!.stdin!.write(JSON.stringify(notification) + '\n');
+      };
+
+      // 1. Initialize the app-server
+      await sendRequest('initialize', {
+        clientInfo: {
+          name: 'automaker',
+          title: 'AutoMaker',
+          version: '1.0.0',
+        },
+      });
+
+      // 2. Send initialized notification
+      sendNotification('initialized');
+
+      // 3. Execute user-provided requests
+      const result = await requestFn(sendRequest);
+
+      // Clean up
+      rl.close();
+      childProcess.kill('SIGTERM');
+
+      return result;
+    } catch (error) {
+      logger.error('[executeJsonRpc] Failed:', error);
+      return null;
+    } finally {
+      // Ensure process is killed
+      if (childProcess && !childProcess.killed) {
+        childProcess.kill('SIGTERM');
+      }
+    }
+  }
+}