feat(server): add SQLite database module with schema and connection management
Adds persistence/database.ts with openDatabase, getDatabase, closeDatabase,
getSchemaVersion, and CURRENT_SCHEMA_VERSION. Creates 10 tables (metadata,
tiles, entities, components, relationships, bonds, narration_events,
memory_events, stockpile_log, inventions) with WAL journal mode. Includes
8 tests covering table creation, schema versioning, connection reuse, and
data persistence across reopen.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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