docs(openspec): backfill missing proposals

openspec/changes/refactor-db-drizzle/specs/database-access/spec.md

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+## ADDED Requirements
+### Requirement: Use Drizzle ORM for Internal Database
+The system SHALL use Drizzle ORM to access the internal database (`cloud_accounts.db`) and provide type constraints through schema.
+
+#### Scenario: Read cloud account list
+- **WHEN** the system reads the `accounts` table
+- **THEN** returned data SHALL match Drizzle schema types
+
+### Requirement: Keep Compatibility and Validation for External IDE Database
+The system SHALL preserve compatibility logic and runtime validation when accessing the external IDE database (`ItemTable`).
+
+#### Scenario: Read ItemTable key
+- **WHEN** reading a specific key from `ItemTable`
+- **THEN** data that fails validation SHALL be logged as warning and skipped
+
+### Requirement: Maintain Database Connection Stability
+The system SHALL preserve existing WAL, `busy_timeout`, and transaction strategies to avoid migration regressions.
+
+#### Scenario: Transactional write consistency
+- **WHEN** executing write operations
+- **THEN** related updates SHALL be committed within the same transaction