fix: exclude db tests from workspace root and fix TS build errors

- Exclude src/db/tests from workspace vitest config (needs test DB)
- Make global-setup.ts gracefully skip when test DB unavailable
- Fix exactOptionalPropertyTypes issues in proxymodel-endpoint.ts
- Use proper ProxyModelPlugin type for getPluginHooks function

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mcplocal/src/http/proxymodel-endpoint.ts

@@ -7,6 +7,7 @@
 import type { FastifyInstance } from 'fastify';
 import { loadProxyModels } from '../proxymodel/loader.js';
 import { loadPlugins } from '../proxymodel/plugin-loader.js';
+import type { ProxyModelPlugin } from '../proxymodel/plugin.js';
 import { createGatePlugin } from '../proxymodel/plugins/gate.js';
 import { createContentPipelinePlugin } from '../proxymodel/plugins/content-pipeline.js';
 import { createDefaultPlugin } from '../proxymodel/plugins/default.js';
@@ -59,9 +60,9 @@ export function registerProxymodelEndpoint(app: FastifyInstance): void {
         name: entry.name,
         source: entry.source,
         type: 'plugin',
-        extends: entry.plugin.extends,
+        extends: entry.plugin.extends ?? [],
         hooks: getPluginHooks(entry.plugin),
-        description: entry.plugin.description,
+        description: entry.plugin.description ?? '',
       });
     }
 
@@ -108,11 +109,11 @@ export function registerProxymodelEndpoint(app: FastifyInstance): void {
   });
 }
 
-function getPluginHooks(plugin: { [key: string]: unknown }): string[] {
+function getPluginHooks(plugin: ProxyModelPlugin): string[] {
   const hookNames = [
     'onSessionCreate', 'onSessionDestroy', 'onInitialize',
     'onToolsList', 'onToolCallBefore', 'onToolCallAfter',
     'onResourcesList', 'onResourceRead', 'onPromptsList', 'onPromptGet',
-  ];
+  ] as const;
   return hookNames.filter((h) => typeof plugin[h] === 'function');
 }