refactor: Restructure monorepo to apps/server/ and apps/web/ layout

Move src/ → apps/server/ and packages/web/ → apps/web/ to adopt
standard monorepo conventions (apps/ for runnable apps, packages/
for reusable libraries). Update all config files, shared package
imports, test fixtures, and documentation to reflect new paths.

Key fixes:
- Update workspace config to ["apps/*", "packages/*"]
- Update tsconfig.json rootDir/include for apps/server/
- Add apps/web/** to vitest exclude list
- Update drizzle.config.ts schema path
- Fix ensure-schema.ts migration path detection (3 levels up in dev,
  2 levels up in dist)
- Fix tests/integration/cli-server.test.ts import paths
- Update packages/shared imports to apps/server/ paths
- Update all docs/ files with new paths

apps/server/cli/trpc-client.ts

@@ -0,0 +1,57 @@
+/**
+ * tRPC Client for CLI
+ *
+ * Type-safe client for communicating with the coordination server.
+ * Uses splitLink to route subscriptions to SSE and queries/mutations to HTTP batch.
+ */
+
+import { createTRPCClient, httpBatchLink, splitLink, httpSubscriptionLink } from '@trpc/client';
+import type { AppRouter } from '../trpc/index.js';
+
+/** Default server port */
+const DEFAULT_PORT = 3847;
+
+/** Default server host */
+const DEFAULT_HOST = '127.0.0.1';
+
+/**
+ * Type-safe tRPC client for the coordination server.
+ */
+export type TrpcClient = ReturnType<typeof createTRPCClient<AppRouter>>;
+
+/**
+ * Creates a tRPC client for the coordination server.
+ *
+ * @param port - Server port (default: 3847)
+ * @param host - Server host (default: 127.0.0.1)
+ * @returns Type-safe tRPC client
+ */
+export function createTrpcClient(
+  port: number = DEFAULT_PORT,
+  host: string = DEFAULT_HOST
+): TrpcClient {
+  const url = `http://${host}:${port}/trpc`;
+  return createTRPCClient<AppRouter>({
+    links: [
+      splitLink({
+        condition: (op) => op.type === 'subscription',
+        true: httpSubscriptionLink({ url }),
+        false: httpBatchLink({ url }),
+      }),
+    ],
+  });
+}
+
+/**
+ * Creates a tRPC client using environment variables or defaults.
+ *
+ * Uses CW_PORT and CW_HOST environment variables if available,
+ * falling back to defaults (127.0.0.1:3847).
+ *
+ * @returns Type-safe tRPC client
+ */
+export function createDefaultTrpcClient(): TrpcClient {
+  const port = process.env.CW_PORT ? parseInt(process.env.CW_PORT, 10) : DEFAULT_PORT;
+  const host = process.env.CW_HOST ?? DEFAULT_HOST;
+  return createTrpcClient(port, host);
+}