feat(sqlite): switch to @libsql/client, add migration journal generation

[dmitriyeff]

Summary

• Replaces better-sqlite3 (requires native C compilation, fails on Node v24) with @libsql/client (ships prebuilt WASM — no compilation needed)
• Adds generateMigrationJournal to emit src/database/migrations/meta/_journal.json with the correct Drizzle dialect per database, so drizzle-kit can validate and apply migrations without error
• SQLite runMigrations is now properly awaited (libsql migrator is async)
• SQLite default DB URL updated to file:./data.db (libsql URL format)
• Tests updated to assert @libsql/client / drizzle-orm/libsql and new journal file content

Test plan

• npm test — 87/87 pass
• Merge conflict with AINATIVEM-44 (generateDockerCompose vs generateMigrationJournal) resolved — both functions kept