release: v1.1.0 — LaTeX parsing overhaul, LLM probe config, extra_headers fix, notebook UUID fix

- Rewrite LaTeX block math normalization with heuristic-based $→$$ promotion
- Move LLM diagnostic probe max_tokens from env var to agents.yaml
- Fix extra_headers merge in LLM factory complete/stream (prevents TypeError)
- Fix SaveToNotebookModal to use notebook UUIDs instead of category IDs (#301)
- Add Docker + local LLM (host.docker.internal) guidance in env/compose files
- Add tests: LaTeX, notebook router, summarize agent, LLM probe, extra_headers
- Add v1.1.0 release notes and update README

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