feat(store): M0 SQLite 存储层 + modernc.org/sqlite
- 引入 modernc.org/sqlite(纯 Go 无 CGO,保持单二进制分发)
- store/db.go: Open/Close/IntegrityCheck + WAL/foreign_keys/synchronous PRAGMA
- store/settings.go: key-value CRUD,Get/Set/Delete/GetAll/SetBatch,带 int/bool/duration 类型 helper
- store/voices.go: 完整 CRUD + ErrDuplicate/ErrNotFound/ErrInUse,name 白名单 [a-zA-Z0-9_-]{1,64}
- store/migrate.go: schema 版本号占位(migrate 调度留待 v2)
- 27 个单测覆盖:CRUD/Pragma/Idempotent/Integrity/Unique/DefaultSpeaker 保护
- 测试覆盖率 70.7%,测试二进制 +0.87MB(预期 +30MB,实际大幅低于预期)
- 不改 setting/config.go、main.go、router、controller(按 M0 计划保持改动局部)
验证: go vet ./... 干净; go test ./... store 包全绿
sun
865fdd81e8