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/penis_worship_il.json

@@ -2,34 +2,35 @@
   "action_id": "penis_worship_il",
   "action_name": "Penis Worship Il",
   "action": {
-    "full_body": "kneeling on the floor, slight forward lean, submissive posture",
-    "head": "tilted back, face looking upward, chin up",
-    "eyes": "looking up, crossed eyes, rolling eyes, or intense eye contact",
-    "arms": "reaching forward or resting on thighs",
-    "hands": "holding object, touching shaft, or hands clasped in prayer gesture",
-    "torso": "arched back, chest pressed forward",
-    "pelvis": "kneeling, hips pushed back or resting on heels",
-    "legs": "knees on ground, shins flat",
-    "feet": "toes curled or resting flat",
-    "additional": "pov, penis in foreground, saliva trail, reverence, anticipation"
-  },
-  "participants": {
-    "solo_focus": "true",
-    "orientation": "MF"
+    "full_body": "kneeling, leaning_forward",
+    "head": "tilted_back, looking_up, blushing",
+    "eyes": "heart-shaped_pupils, cross-eyed, looking_at_penis",
+    "arms": "arms_up, bent_arms",
+    "hands": "praying, interlaced_fingers",
+    "torso": "leaning_forward",
+    "pelvis": "kneeling",
+    "legs": "kneeling",
+    "feet": "kneeling",
+    "additional": "open_mouth, tongue_out, saliva, intense_gaze, penis_awe"
   },
   "lora": {
     "lora_name": "Illustrious/Poses/Penis_Worship_IL.safetensors",
-    "lora_weight": 1.0,
-    "lora_triggers": "Penis_Worship_IL"
+    "lora_weight": 0.85,
+    "lora_triggers": "penis worship, penis awe"
   },
   "tags": [
-    "penis worship",
+    "penis_awe",
+    "looking_at_penis",
     "kneeling",
-    "submissive",
-    "looking up",
-    "open mouth",
-    "tongue",
-    "pov",
-    "fellatio"
+    "praying",
+    "looking_up",
+    "heart-shaped_pupils",
+    "ahegao",
+    "blush",
+    "open_mouth",
+    "saliva",
+    "facial",
+    "cum",
+    "worship"
   ]
 }