refactor(server): extract createApp function for server initialization

- Replace Server.App() with Server.Default() for internal server access
- Extract server app creation into Server.createApp(opts) for testability
- Move CORS whitelist from module-level variable to function parameter
- Update all tests to use Server.Default() instead of Server.App()

packages/opencode/src/cli/cmd/run.ts

@@ -667,7 +667,7 @@ export const RunCommand = cmd({
     await bootstrap(process.cwd(), async () => {
       const fetchFn = (async (input: RequestInfo | URL, init?: RequestInit) => {
         const request = new Request(input, init)
-        return Server.App().fetch(request)
+        return Server.Default().fetch(request)
       }) as typeof globalThis.fetch
       const sdk = createOpencodeClient({ baseUrl: "http://opencode.internal", fetch: fetchFn })
       await execute(sdk)

packages/opencode/src/cli/cmd/tui/worker.ts

@@ -54,7 +54,7 @@ const startEventStream = (input: { directory: string; workspaceID?: string }) =>
     const request = new Request(input, init)
     const auth = getAuthorizationHeader()
     if (auth) request.headers.set("Authorization", auth)
-    return Server.App().fetch(request)
+    return Server.Default().fetch(request)
   }) as typeof globalThis.fetch
 
   const sdk = createOpencodeClient({
@@ -110,7 +110,7 @@ export const rpc = {
       headers,
       body: input.body,
     })
-    const response = await Server.App().fetch(request)
+    const response = await Server.Default().fetch(request)
     const body = await response.text()
     return {
       status: response.status,

packages/opencode/src/plugin/index.ts

@@ -25,8 +25,7 @@ export namespace Plugin {
     const client = createOpencodeClient({
       baseUrl: "http://localhost:4096",
       directory: Instance.directory,
-      // @ts-ignore - fetch type incompatibility
-      fetch: async (...args) => Server.App().fetch(...args),
+      fetch: async (...args) => Server.Default().fetch(...args),
     })
     const config = await Config.get()
     const hooks: Hooks[] = []
@@ -35,7 +34,9 @@ export namespace Plugin {
       project: Instance.project,
       worktree: Instance.worktree,
       directory: Instance.directory,
-      serverUrl: Server.url(),
+      get serverUrl(): URL {
+        throw new Error("Server URL is no longer supported in plugins")
+      },
       $: Bun.$,
     }