feat: integrate persistent Hermes memory service & align with upstream/main

[abdulsamed1]

This PR integrates the Hermes persistent conversation memory system into freellmapi, fully merged with the latest changes from upstream/main (including the dashboard user authentication sessions and the Responses API shim).

Key Features Integrated:

• Persistent Conversation Memory: Enables long-term chat session history, parent-child lineages (using recursive CTEs), full-text search (FTS5) index syncing, and token/cost metric aggregation.
• Table Collision Resolution: Renamed the Hermes session database table to chat_sessions to prevent schema conflicts with the upstream dashboard authentication sessions table.
• Responses API Alignment: Unified route handling so that all Responses API calls properly target the upstream responsesRouter for formatting SSE event streams.
• Client Stability: Fixed React 19 types within client/src/components/markdown.tsx to ensure clean workspace compilation.

Verification Results

• All server-side unit, integration, and routing tests build and pass cleanly: 27 test files passed (206 tests).
• Client and server workspaces built successfully with zero errors.

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