Created /ask command with AI provider architecture

[Wikijito7]

Solves #30

📋 Changelist Summary

Created /ask command that sends prompts to an AI API via a provider-agnostic architecture and generates TTS with the answer.

💬 Description

• Provider-agnostic interface: AIProvider strategy pattern (HuggingFaceProvider as primary, DuckAIProvider ready for future).
• /ask <prompt> slash command: Sends prompt to AI, responds with the answer in Discord + TTS in voice channel.
• Message context menu ("Ask AI"): Right-click any message → sends its content as prompt.
• HuggingFace Inference API: Uses Ktor directly (no HuggingFace library), OpenAI-compatible endpoint.
• Architecture: Follows existing project patterns (Koin DI, Command interface, LocalizationService, GuildQueueService, TTSService).

Note: Duck.ai PoC was built and proven to work (JS challenge solved in Node.js), but fingerprint emulation makes it fragile. The interface is ready for it when the API stabilizes.

ℹ️ Extra info

This PR was created using AI. Please review carefully before merging.

🐵 AI-Generated PR Disclaimer

This pull request was created with assistance from AI. While the code compiles successfully and all existing tests pass, please review the implementation carefully for correctness, security, and alignment with project conventions before merging.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
78.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud