Add danbooru-mcp auto-start, git sync, status API endpoints, navbar status indicators, and LLM format retry

- app.py: add subprocess import; add _ensure_mcp_repo() to clone/pull
  danbooru-mcp from https://git.liveaodh.com/aodhan/danbooru-mcp into
  tools/danbooru-mcp/ at startup; add ensure_mcp_server_running() which
  calls _ensure_mcp_repo() then starts the Docker container if not running;
  add GET /api/status/comfyui and GET /api/status/mcp health endpoints;
  fix call_llm() to retry up to 3 times on unexpected response format
  (KeyError/IndexError), logging the raw response and prompting the LLM
  to respond with valid JSON before each retry
- templates/layout.html: add ComfyUI and MCP status dot indicators to
  navbar; add polling JS that checks both endpoints on load and every 30s
- static/style.css: add .service-status, .status-dot, .status-ok,
  .status-error, .status-checking styles and status-pulse keyframe animation
- .gitignore: add tools/ to exclude the cloned danbooru-mcp repo

data/checkpoints/illustrious_cutecandymix_illustrious.json

@@ -2,9 +2,10 @@
   "checkpoint_path": "Illustrious/cutecandymix_illustrious.safetensors",
   "checkpoint_name": "cutecandymix_illustrious.safetensors",
   "base_positive": "masterpiece, best quality, very aesthetic, absurdres, year 2023",
-  "base_negative": "lowres, (bad), text, error, fewer, extra, missing, worst quality, jpeg artifacts, low quality, watermark, unfinished, displeasing, oldest, early, chromatic aberration, signature, extra digits, artistic error, username, scan, (abstract:0.9), nsfw",
+  "base_negative": "lowres, (bad), text, error, fewer, extra, missing, worst quality, jpeg artifacts, low quality, watermark, unfinished, displeasing, oldest, early, chromatic aberration, signature, extra digits, artistic error, username, scan, (abstract:0.9), ",
   "steps": 28,
   "cfg": 5.0,
-  "sampler_name": "euler_ancestral",
+  "scheduler": "normal",
+  "sampler_name":  "euler_ancestral",
   "vae": "sdxl_vae.safetensors"
 }