feat(server): add recipe-based model management (#2176)

examples/server/recipes/sefi-image.json

@@ -0,0 +1,39 @@
+{
+  "schema_version": 1,
+  "id": "sefi-image",
+  "name": "SeFi Image 5B RL",
+  "model_url": "https://huggingface.co/SeFi-Image/SeFi-Image-5B-Base",
+  "slots": [
+    {
+      "id": "diffusion_model",
+      "required": true
+    },
+    {
+      "id": "llm",
+      "required": true,
+      "label": "Qwen 3 VL 4B Text Encoder"
+    },
+    {
+      "id": "vae",
+      "required": false
+    },
+    {
+      "id": "tae",
+      "required": false
+    }
+  ],
+  "required_any": [
+    [
+      "vae",
+      "tae"
+    ]
+  ],
+  "defaults": {
+    "cfg_scale": 4,
+    "steps": 20,
+    "sampling_method": "euler"
+  },
+  "features": [
+    "slg"
+  ]
+}