[FEATURE] AI 1 : Provider Abstraction Layer (Anthropic, Groq, Gemini)

[TFT444]

Objective

Build the provider abstraction layer that handles communication
with AI APIs. This is the foundation all other AI features depend on.

What needs to be built

• api/services/ai_provider.py
• Single get_completion(provider, api_key, prompt) function
• Support providers: anthropic, groq, gemini
• Validate provider name, raise clear error if unsupported
• Handle rate limits, invalid keys and network failures gracefully
• No API keys stored or logged anywhere

Acceptance criteria

• Works end to end with at least one provider
• Invalid provider returns a clear error
• Invalid API key returns a clear error, does not crash
• No keys stored server-side

Priority

High

Assignees

@TFT444