Add Checkpoints Gallery with per-checkpoint generation settings

- New Checkpoint model (slug, name, checkpoint_path, data JSON, image_path)
- sync_checkpoints() loads metadata from data/checkpoints/*.json and falls
  back to template defaults for models without a JSON file
- _apply_checkpoint_settings() applies per-checkpoint steps, CFG, sampler,
  base positive/negative prompts, and VAE (with dynamic VAELoader node
  injection for non-integrated VAEs) to the ComfyUI workflow
- Bulk Create from Checkpoints: scans Illustrious/Noob model directories,
  reads matching HTML files, uses LLM to populate metadata, falls back to
  template defaults when no HTML is present
- Gallery index with batch cover generation and WebSocket progress bar
- Detail page showing Generation Settings and Base Prompts cards
- Checkpoints nav link added to layout
- New data/prompts/checkpoint_system.txt LLM system prompt
- Updated README with all current galleries and file structure
- Also includes accumulated action/scene JSON updates, new actions, and
  other template/generator improvements from prior sessions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/actions/face_grab_illustrious.json

@@ -2,35 +2,32 @@
   "action_id": "face_grab_illustrious",
   "action_name": "Face Grab Illustrious",
   "action": {
-    "full_body": "medium shot or close up of a character having their face grabbed by a hand",
-    "head": "face obscured by hand, cheeks squeezed, skin indentation from fingers, annoyed or pained expression",
-    "eyes": "squinting or partially covered by fingers",
-    "arms": "raised upwards attempting to pry the hand away",
-    "hands": "holding the wrist or forearm of the grabbing hand",
-    "torso": "upper body slightly leaned back from the force of the grab",
-    "pelvis": "neutral alignment",
-    "legs": "standing still",
-    "feet": "planted firmly",
-    "additional": "the grabbing hand usually belongs to another person or is an off-screen entity, commonly referred to as the iron claw technique"
-  },
-  "participants": {
-    "solo_focus": "true",
-    "orientation": "MF"
+    "full_body": "POV close-up of a character having their face grabbed by the viewer",
+    "head": "forced expression, open mouth, tongue out, pout, grabbing cheeks or chin",
+    "eyes": "looking at viewer, crying, streaming tears",
+    "arms": "often not visible or passive",
+    "hands": "pov hands, hand grabbing face",
+    "torso": "upper body, often nude or partially visible",
+    "pelvis": "usually out of frame",
+    "legs": "out of frame",
+    "feet": "out of frame",
+    "additional": "context often after fellatio with fluids on face or tongue"
   },
   "lora": {
     "lora_name": "Illustrious/Poses/face_grab_illustrious.safetensors",
-    "lora_weight": 1.0,
-    "lora_triggers": "face_grab_illustrious"
+    "lora_weight": 0.5,
+    "lora_triggers": "fcgrb, face grab, grabbing another's face, pov, pov hand, open mouth, tongue out"
   },
   "tags": [
-    "face grab",
-    "iron claw",
-    "hand on face",
-    "hand over face",
-    "skin indentation",
-    "squeezed face",
-    "fingers on face",
-    "forced",
-    "cheek pinch"
+    "grabbing_another's_face",
+    "pov",
+    "pov_hands",
+    "after_fellatio",
+    "cum_on_tongue",
+    "open_mouth",
+    "tongue_out",
+    "pout",
+    "streaming_tears",
+    "cheek_pinching"
   ]
 }