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/looks/hatsune_miku_project_diva__style.json

@@ -0,0 +1,21 @@
+{
+  "look_id": "hatsune_miku_project_diva__style",
+  "look_name": "Hatsune Miku Project Diva Style",
+  "character_id": "hatsune_miku",
+  "positive": "project_diva_style99, 3d, project_diva, hatsune_miku, 1girl, aqua_hair, twintails, game_cg, vocaloid",
+  "negative": "2d, flat_color, sketch, monochrome, lowres, bad_anatomy, worst_quality",
+  "lora": {
+    "lora_name": "Illustrious/Looks/Hatsune_Miku_Project_DIVA__Style.safetensors",
+    "lora_weight": 0.8,
+    "lora_triggers": "project_diva_style99, 3d",
+    "lora_weight_min": 0.8,
+    "lora_weight_max": 0.8
+  },
+  "tags": [
+    "open_mouth",
+    "on_stage",
+    "vocaloid",
+    "hatsune_miku",
+    "project_diva"
+  ]
+}