feat(m1): storage layer
- Shared SQLite plumbing: PRAGMAs (WAL/NORMAL/foreign_keys) and
user_version migrations with typed SchemaVersionException
- Workspace folder: .ykanban initialization, empty schema with
DDL-level constraints, preset column seeding (ResX-driven),
exclusive lock file with holder diagnostics
- AppData folder: app.db workspace registry (injectable clock),
app.json config store with kebab-case JSON names via explicit
[JsonProperty]/[EnumMember], nested sections, corrupt-file backup
- ResX infrastructure under Assets/Locales (en + zh-Hans) with
MSBuild strongly-typed public Resources class
- 54 unit tests: DDL constraints, migrations, PRAGMAs, lock
exclusivity, config degradation, culture-aware presets
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