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/git/index.ts

@@ -0,0 +1,23 @@
+/**
+ * Git Module - Public API
+ *
+ * Exports the WorktreeManager port interface, types, and adapters.
+ * All modules should import from this index file.
+ *
+ * Pattern follows EventBus module:
+ * - Port interface (WorktreeManager) is what consumers depend on
+ * - Adapter implementation (SimpleGitWorktreeManager) uses simple-git
+ */
+
+// Port interface (what consumers depend on)
+export type { WorktreeManager } from './types.js';
+
+// Domain types
+export type { Worktree, WorktreeDiff, MergeResult } from './types.js';
+
+// Adapters
+export { SimpleGitWorktreeManager } from './manager.js';
+
+// Utilities
+export { cloneProject } from './clone.js';
+export { ensureProjectClone, getProjectCloneDir } from './project-clones.js';