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/trpc/routers/account.ts

@@ -0,0 +1,76 @@
+/**
+ * Account Router — list, add, remove, refresh, update auth, mark exhausted, providers
+ */
+
+import { z } from 'zod';
+import type { ProcedureBuilder } from '../trpc.js';
+import { requireAccountRepository } from './_helpers.js';
+import { listProviders as listProviderNames } from '../../agent/providers/registry.js';
+
+export function accountProcedures(publicProcedure: ProcedureBuilder) {
+  return {
+    listAccounts: publicProcedure
+      .query(async ({ ctx }) => {
+        const repo = requireAccountRepository(ctx);
+        return repo.findAll();
+      }),
+
+    addAccount: publicProcedure
+      .input(z.object({
+        email: z.string().min(1),
+        provider: z.string().default('claude'),
+        configJson: z.string().optional(),
+        credentials: z.string().optional(),
+      }))
+      .mutation(async ({ ctx, input }) => {
+        const repo = requireAccountRepository(ctx);
+        return repo.create({
+          email: input.email,
+          provider: input.provider,
+          configJson: input.configJson,
+          credentials: input.credentials,
+        });
+      }),
+
+    removeAccount: publicProcedure
+      .input(z.object({ id: z.string().min(1) }))
+      .mutation(async ({ ctx, input }) => {
+        const repo = requireAccountRepository(ctx);
+        await repo.delete(input.id);
+        return { success: true };
+      }),
+
+    refreshAccounts: publicProcedure
+      .mutation(async ({ ctx }) => {
+        const repo = requireAccountRepository(ctx);
+        const cleared = await repo.clearExpiredExhaustion();
+        return { cleared };
+      }),
+
+    updateAccountAuth: publicProcedure
+      .input(z.object({
+        id: z.string().min(1),
+        configJson: z.string(),
+        credentials: z.string(),
+      }))
+      .mutation(async ({ ctx, input }) => {
+        const repo = requireAccountRepository(ctx);
+        return repo.updateAccountAuth(input.id, input.configJson, input.credentials);
+      }),
+
+    markAccountExhausted: publicProcedure
+      .input(z.object({
+        id: z.string().min(1),
+        until: z.string().datetime(),
+      }))
+      .mutation(async ({ ctx, input }) => {
+        const repo = requireAccountRepository(ctx);
+        return repo.markExhausted(input.id, new Date(input.until));
+      }),
+
+    listProviderNames: publicProcedure
+      .query(() => {
+        return listProviderNames();
+      }),
+  };
+}