Add test/prod environments for databases

- Migration 010: test_* columns on databases table, environment column on request_logs
- DatabasePoolManager: dual-pool strategy (prod + test), getPool(id, env) with fallback
- All executors (SQL, Script, AQL): environment param threaded through execution paths
- dynamicApiController: X-Environment header detection, environment in logging
- databaseManagementController: CRUD for test credentials, testConnection with ?env=test
- Frontend: test env form in DatabaseModal, env toggle in EndpointEditor test panel

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/src/controllers/endpointController.ts

@@ -2,7 +2,7 @@ import { Response } from 'express';
 import { AuthRequest } from '../middleware/auth';
 import { mainPool } from '../config/database';
 import { v4 as uuidv4 } from 'uuid';
-import { ExportedEndpoint, ExportedScriptQuery, ScriptExecutionError } from '../types';
+import { ExportedEndpoint, ExportedScriptQuery, ScriptExecutionError, Environment } from '../types';
 import { encryptEndpointData, decryptEndpointData } from '../services/endpointCrypto';
 
 export const getEndpoints = async (req: AuthRequest, res: Response) => {
@@ -287,8 +287,10 @@ export const testEndpoint = async (req: AuthRequest, res: Response) => {
       aql_endpoint,
       aql_body,
       aql_query_params,
+      environment: reqEnv,
     } = req.body;
 
+    const environment: Environment = reqEnv === 'prod' ? 'prod' : 'test';
     const execType = execution_type || 'sql';
 
     if (execType === 'sql') {
@@ -314,7 +316,7 @@ export const testEndpoint = async (req: AuthRequest, res: Response) => {
       }
 
       const { sqlExecutor } = require('../services/SqlExecutor');
-      const result = await sqlExecutor.executeQuery(database_id, processedQuery, parameters || []);
+      const result = await sqlExecutor.executeQuery(database_id, processedQuery, parameters || [], environment);
 
       res.json({
         success: true,
@@ -346,6 +348,7 @@ export const testEndpoint = async (req: AuthRequest, res: Response) => {
         scriptQueries: script_queries || [],
         requestParams,
         endpointParameters: endpoint_parameters || [],
+        environment,
       });
 
       res.json({
@@ -377,7 +380,7 @@ export const testEndpoint = async (req: AuthRequest, res: Response) => {
         body: aql_body,
         queryParams: aql_query_params,
         parameters: requestParams,
-      });
+      }, environment);
 
       res.json({
         success: true,