feat: rewrite database schema synchronization with automatic recovery (#379)

Complete rewrite of the Hermes SQLite database schema synchronization mechanism
with comprehensive error handling, automatic recovery, and full test coverage.

## Database Schema Synchronization
- **Unified sync mechanism**: Single `syncTable()` function handles all schema changes
- **Automatic column sync**: Adds missing columns and removes extra columns
- **Table rebuilding**: Automatically rebuilds tables when primary keys or types change
- **Data preservation**: Preserves data during schema changes when compatible
- **Index management**: Creates and removes indexes as needed

## Error Recovery & Reliability
- **Automatic backup**: Backs up corrupted database before recovery
- **Retry limiting**: Prevents infinite loops with retry limit
- **Duplicate prevention**: Avoids multiple backup files
- **Safe file operations**: Uses copy+delete instead of rename for safety

## Composite Primary Keys
- Fixed GC_ROOM_AGENTS and GC_ROOM_MEMBERS with proper composite primary keys
- Prevents duplicate entries while allowing same roomId with different agentId/userId

## Test Coverage
- **10 new integration tests** for schema synchronization (tests/server/schema-sync.test.ts)
- **3 updated tests** for Hermes schemas (tests/server/hermes-schemas.test.ts)
- All 327 tests passing (47 test files, 325 passed, 2 skipped)

## Bug Fixes
- Fixed module import issues (unified ES6 imports, removed mixed require())
- Fixed mock issues in sessions routes tests
- Fixed i18n coverage test to handle newly added keys
- Fixed profiles store test to match current implementation

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/server/sessions-routes.test.ts

@@ -4,6 +4,8 @@ const listConversationsMock = vi.fn(async (ctx: any) => { ctx.body = { sessions:
 const getConversationMessagesMock = vi.fn(async (ctx: any) => { ctx.body = { session_id: ctx.params.id, messages: [] } })
 const getConversationMessagesPaginatedMock = vi.fn(async (ctx: any) => { ctx.body = { session_id: ctx.params.id, messages: [], pagination: {} } })
 const listMock = vi.fn(async (ctx: any) => { ctx.body = { sessions: [{ id: 's1' }] } })
+const listHermesSessionsMock = vi.fn(async (ctx: any) => { ctx.body = { sessions: [{ id: 'hermes-1' }] } })
+const getHermesSessionMock = vi.fn(async (ctx: any) => { ctx.body = { session: { id: ctx.params.id } } })
 const searchMock = vi.fn(async (ctx: any) => { ctx.body = { results: [{ id: 'search-1' }] } })
 const getMock = vi.fn(async (ctx: any) => { ctx.body = { session: { id: ctx.params.id } } })
 const removeMock = vi.fn(async (ctx: any) => { ctx.body = { ok: true } })
@@ -20,6 +22,8 @@ vi.mock('../../packages/server/src/controllers/hermes/sessions', () => ({
   getConversationMessages: getConversationMessagesMock,
   getConversationMessagesPaginated: getConversationMessagesPaginatedMock,
   list: listMock,
+  listHermesSessions: listHermesSessionsMock,
+  getHermesSession: getHermesSessionMock,
   search: searchMock,
   get: getMock,
   remove: removeMock,