## Summary
Moves the `schema_migrations` table definition from inline Go code into `internal/database/schema/000.sql`, so the migration tracking table schema lives alongside all other schema files.
closes#29
## Changes
### New file: `internal/database/schema/000.sql`
- Contains the `CREATE TABLE IF NOT EXISTS schema_migrations` DDL
- This is applied as a bootstrap step before the normal migration loop
### Refactored: `internal/database/database.go`
- Removed the inline `CREATE TABLE IF NOT EXISTS schema_migrations` SQL from both `runMigrations` and `ApplyMigrations`
- Added `bootstrapMigrationsTable()` which:
- Checks `sqlite_master` to see if the table already exists
- If missing: reads and executes `000.sql` to create it, then records version `000`
- If present (backwards compat with existing DBs created by old inline code): back-fills version `000` so the normal loop skips the bootstrap file
- Deduplicated: both `Database.runMigrations()` and the exported `ApplyMigrations()` now delegate to a single `applyMigrations()` helper
- Added `logInfo`/`logDebug` helpers to handle the optional logger (nil when called from `ApplyMigrations` in tests)
### New file: `internal/database/database_test.go`
- `TestApplyMigrations_CreatesSchemaAndTables` — verifies all migrations apply and all expected tables exist
- `TestApplyMigrations_Idempotent` — verifies running migrations twice produces no errors or duplicates
- `TestBootstrapMigrationsTable_FreshDatabase` — verifies bootstrap creates the table and records version 000
- `TestBootstrapMigrationsTable_ExistingTableBackwardsCompat` — verifies existing DBs (from old inline-SQL code) get version 000 back-filled without data loss
## Conflict note
[PR #33](#33) (for [issue #28](#28)) is also modifying migration code. This PR is based on current `main` and the conflict will be resolved at merge time.
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Reviewed-on: #36
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