fix: replace @/ path alias with relative imports in MCP server

The @/ alias resolves via tsconfig but not in production where
Bun runs server files directly. Use relative paths instead.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server/mcp/index.ts

@@ -2,7 +2,7 @@ import { randomUUID } from "node:crypto";
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { WebStandardStreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/webStandardStreamableHttp.js";
 import { Hono } from "hono";
-import { db as prodDb } from "@/db/index.ts";
+import { db as prodDb } from "../../db/index.ts";
 import { getUserCount, verifyApiKey } from "../services/auth.service.ts";
 import { getCollectionSummary } from "./resources/collection.ts";
 import {