phase-9: domain-driven architecture complete

- Restructured server layer with 5 domains: shared, screener, portfolio, calls, finance
- Migrated 58 TypeScript files to domain-driven structure
- Updated CLAUDE.md with new architecture documentation
- Added .gitignore rules for .md files (except CLAUDE.md)
- Removed unused CatalystAnalyst import from app.ts
- Fixed lint errors: removed unused imports, fixed regex escape, added console suppressions
- Verified no sensitive data in git history
- Server code compiles cleanly with TypeScript strict mode

server/domains/shared/db/index.ts

@@ -0,0 +1,32 @@
+/**
+ * Database layer — barrel export (ONLY re-exports, no logic).
+ *
+ * This file is the SINGLE public API for all database functionality.
+ * All imports should come from here, not from individual files.
+ *
+ * USAGE:
+ *   import { createDb, DatabaseConnection, QueryAudit } from './db/index.js';
+ *   import type { AuditEntry } from './db/index.js';
+ *
+ * FILE ORGANIZATION:
+ * - DatabaseInitializer.ts: createDb() function + migrations (pure functions)
+ * - QueryAudit.ts: class QueryAudit (logging service)
+ * - DatabaseConnection.ts: class DatabaseConnection (data access service)
+ * - index.ts: THIS FILE (barrel re-exports only)
+ *
+ * SECURITY:
+ * - All queries use parameterized statements (QueryBuilder + DatabaseConnection)
+ * - No SQL injection possible via table/column/parameter names
+ * - Audit trail tracks all mutations for compliance
+ */
+
+// Initialization
+export { createDb, type Db } from './DatabaseInitializer';
+
+// Data access
+export { DatabaseConnection } from './DatabaseConnection';
+export { QueryAudit } from './QueryAudit';
+
+// Types
+export { AuditAction } from '../types/database.model';
+export type { AuditEntry, DatabaseOptions } from '../types/database.model';