fix: Resolve all startup errors and launch Agent Bot service

[RandithaK]

• Adapt agent_core for LangChain 0.1.6 (STRUCTURED_CHAT agent)
• Add missing imports and singleton functions
• Make Pinecone initialization resilient
• Create requirements.txt and .env configuration
• Service now running successfully on port 8091

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bot-fix

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