- Add IDatabaseService interface with unified query(transaction) methods
- Create DatabaseFactory for centralized database service creation
- Modify MySqlService and SqlServerService to implement IDatabaseService
- Unify SqlServerService.query() to accept array params (internally converts to @p0, @p1...)
- Refactor OrderNumberResolver to use IDatabaseService
- Refactor DiscreteMaterialPlanDAO to use DatabaseFactory
- Refactor MaterialsToBeDeletedDAO to use DatabaseFactory
- Update IPC handlers to use DatabaseFactory.create()
- Add database.types.ts with shared type definitions
This enables switching between MySQL and SQL Server via DB_TYPE env variable.
Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>
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