Integrate Jina AI models and APIs

[Undertaker-afk]

Integrate Jina AI models and APIs into the app.

• models.py: Add functions to return Jina chat, embedding, and rate limiter instances using the requests library.
• agent.py: Import requests library, update AgentConfig class to include Jina models, and add methods to use Jina models for chat and embedding.
• docker/run/Dockerfile: Add installation steps for the requests library.
• python/tools/knowledge_tool.py: Update Knowledge class to use Jina AI models or APIs for knowledge search using the requests library.
• docs/architecture.md: Update system architecture to include Jina AI models and APIs.
• webui/index.html: Add new input sections for the newly added tools and models.
• webui/js/settings.js: Add new input sections for the newly added tools and models, including API key settings and model selector for Jina AI.

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For more details, open the Copilot Workspace session.