The tower repo had business logic beyond simple CRUD: AddGem used a
fetch-transform-save pattern, progress capping was inline in the
handler, and RP donation orchestrated multiple repo calls with
conditional page advancement. Move these into a new TowerService
following the established service layer pattern.
Fix errcheck violations across 11 repo files by wrapping deferred
rows.Close() and tx.Rollback() calls to discard the error return.
Fix unchecked Scan/Exec calls in guild store tests. Fix staticcheck
SA9003 empty branch in test helpers.
Add 6 mock-based unit tests for GetCharacterSaveData covering nil
savedata, sql.ErrNoRows, DB errors, compressed round-trip,
new-character skip, and config mode/pointer propagation.
Move all direct DB calls from handlers_festa.go (23 calls across 8
tables) and handlers_tower.go (16 calls across 4 tables) into
dedicated repository structs following the established pattern.
FestaRepository (14 methods): lifecycle cleanup, event management,
team souls, trial stats/rankings, user state, voting, registration,
soul submission, prize claiming/enumeration.
TowerRepository (12 methods): personal tower data (skills, progress,
gems), guild tenrouirai progress/scores/page advancement, tower RP.
Also fix pre-existing nil pointer panics in integration tests by
adding SetTestDB helper that initializes both the DB connection and
all repositories, and wire the done channel in createTestServerWithDB
to prevent Shutdown panics.
