feat: add HOSTNAME and VITE_HOSTNAME support for improved server URL configuration

- Introduced `HOSTNAME` environment variable for user-facing URLs, defaulting to localhost.
- Updated server and client code to utilize `HOSTNAME` for constructing URLs instead of hardcoded localhost.
- Enhanced documentation in CLAUDE.md to reflect new configuration options.
- Added `VITE_HOSTNAME` for frontend API URLs, ensuring consistent hostname usage across the application.

These changes improve flexibility in server configuration and enhance the user experience by providing accurate URLs.

apps/server/src/services/dev-server-service.ts

@@ -379,10 +379,11 @@ class DevServerService {
 
     // Create server info early so we can reference it in handlers
     // We'll add it to runningServers after verifying the process started successfully
+    const hostname = process.env.HOSTNAME || 'localhost';
     const serverInfo: DevServerInfo = {
       worktreePath,
       port,
-      url: `http://localhost:${port}`,
+      url: `http://${hostname}:${port}`,
       process: devProcess,
       startedAt: new Date(),
       scrollbackBuffer: '',
@@ -474,7 +475,7 @@ class DevServerService {
       result: {
         worktreePath,
         port,
-        url: `http://localhost:${port}`,
+        url: `http://${hostname}:${port}`,
         message: `Dev server started on port ${port}`,
       },
     };
@@ -594,6 +595,7 @@ class DevServerService {
     result?: {
       worktreePath: string;
       port: number;
+      url: string;
       logs: string;
       startedAt: string;
     };
@@ -613,6 +615,7 @@ class DevServerService {
       result: {
         worktreePath: server.worktreePath,
         port: server.port,
+        url: server.url,
         logs: server.scrollbackBuffer,
         startedAt: server.startedAt.toISOString(),
       },