⚡ Bolt: [performance improvement] Fix N+1 query in injectPerUserOAuthTokens hook

[Donach]

💡 What: Introduced a batched method getTokensForServers to query OAuth tokens for multiple server IDs at once. Updated the injectPerUserOAuthTokens hook to pre-fetch all server tokens synchronously before resolving each individual server's OAuth token.
🎯 Why: Iterating over paginated or list requests and awaiting userTokenRepo.getToken for each item generates N+1 queries, significantly increasing database latency for responses containing multiple MCP servers.
📊 Impact: Reduces database queries from O(N) to O(1) for OAuth token resolution when listing servers.
🔬 Measurement: Run the test suite and verify test stability (pnpm test). The mcp-servers list endpoint performance can be measured using any network tracer.

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PR created automatically by Jules for task 17916299599179153157 started by @Donach

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