dashboard: rename Ollama endpoints to /api/llm, remove dead registry browse (PR2)

[AlienWalker1995]

Stacked on #65

Base is the PR1 branch (chore/remove-ollama-refs-pr1), so this shows only the delta. Merge #65 first; GitHub will retarget this to main. Together they leave zero Ollama references in the repo (except CHANGELOG.md history and Open WebUI's ENABLE_OLLAMA_API=false off-switch).

What

The dashboard's /api/ollama/* endpoints were actually managing GGUF/llama.cpp models (misnamed). This renames them to a clean /api/llm/* namespace and removes the one genuinely-dead piece.

• dashboard/app.py: /api/ollama/{models,delete,unload,pull,pull/status,ps} → /api/llm/*; delete the dead /api/ollama/library + _fetch_ollama_library + registry-library config vars; rename _run_ollama_pull→_run_gguf_pull, _ollama_pull_status→_gguf_pull_status, _hf_url_to_ollama→_hf_url_to_repo; reword user-facing strings off Ollama. Behavior-preserving for the 6 live endpoints.
• dashboard/static/index.html: retarget the 5 UI fetch sites; remove the "browse Ollama registry" dropdown (kept pull-by-Hugging-Face-repo input); rename all Ollama UI labels/identifiers. (/api/llm/* chosen because /api/models/* is already ComfyUI's.)
• tests: drop the library test; repoint the global-exception-handler test to /api/llm/models via a patched _scan_gguf_models.
• docker-compose.yml: open-webui OLLAMA_BASE_URL= → ENABLE_OLLAMA_API=false (explicit disable); drop n8n OLLAMA_HOST (it pointed at the LiteLLM gateway, which doesn't speak Ollama's API; n8n's real path is OPENAI_API_BASE_URL).
• Docs: README "Ollama models" section + component-dashboard-ui.md updated to /api/llm.

Validation

• python -m pytest tests/ → 394 passed (the 2 failures are the known local-only hermes_socket/secrets_isolation tests — they pass/skip in CI).
• UI↔backend route cross-check: all 5 UI fetches map to real routes (/api/llm/unload has no UI caller, matching the pre-existing state).
• git grep -in ollama across the combined stack → only CHANGELOG.md + ENABLE_OLLAMA_API.
• index.html re-normalized to its base CRLF so the diff is real edits only (313 lines), not a whole-file EOL flip.

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