feat: add P-H3-Image generation and editing support (#2272)

examples/server/recipes/p-h3-image.json

@@ -0,0 +1,55 @@
+{
+  "schema_version": 1,
+  "id": "p-h3-image",
+  "name": "P-H3-Image",
+  "size_multiple": 32,
+  "description": "Supports text-to-image and reference-image editing with the fixed 8-step schedule. Use the P-H3 single-frame VAE and Qwen3-VL-4B with its vision tower. Supply the P-H3 text connector separately unless it is included in the text encoder.",
+  "model_url": "https://huggingface.co/PrunaAI/P-H3-Image",
+  "slots": [
+    {
+      "id": "diffusion_model",
+      "required": true
+    },
+    {
+      "id": "llm",
+      "required": true,
+      "label": "Qwen 3 VL 4B Text Encoder"
+    },
+    {
+      "id": "llm_vision",
+      "required": false,
+      "label": "Vision projector (required when not included in the text encoder)"
+    },
+    {
+      "id": "embeddings_connectors",
+      "required": false,
+      "label": "P-H3 Text Connector (required when not included in the text encoder)"
+    },
+    {
+      "id": "vae",
+      "required": true,
+      "label": "P-H3 Image VAE"
+    }
+  ],
+  "defaults": {
+    "sampling_method": "euler",
+    "cfg_scale": 1,
+    "steps": 8,
+    "width": 1024,
+    "height": 1024,
+    "custom_sigmas": [
+      1.0,
+      0.984753,
+      0.967905,
+      0.951688,
+      0.925372,
+      0.881923,
+      0.810083,
+      0.528718,
+      0.0
+    ]
+  },
+  "features": [
+    "ref_images"
+  ]
+}