Redesign Settings page: split into Connectors, AI Models, Embeddings

[BeinerChes]

Problem

The current Settings page is a flat list mixing unrelated concerns — Telegram bot token, Ollama URL, AI providers, and setup wizard all sit together under vague headings ("General", "AI Providers", "Setup").

Proposed structure

Split the Settings page into tabbed sections:

1. Connectors

• Telegram Bot Token (existing)
• Future: Discord, webhooks, Slack, etc.

2. AI Models

• Current "AI Providers" CRUD (rename from "AI Providers")
• Add/edit/delete/test OpenAI-compatible providers (OpenAI, Gemini, OpenRouter, etc.)

3. Embeddings

• Ollama URL (existing, currently under "General")
• Future: support non-Ollama embedding providers

Notes

• Setup Wizard is a separate, larger topic — not part of this issue
• Tab style TBD (horizontal tabs under header vs vertical sub-nav)
• "AI Models" chosen over "LLM Providers" / "Model Providers" for clarity

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