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

examples/server/recipes/sd3-medium.json

@@ -0,0 +1,33 @@
+{
+  "schema_version": 1,
+  "id": "sd3-medium",
+  "name": "SD 3 Medium",
+  "description": "Checkpoint with CLIP-L, CLIP-G and T5 included.",
+  "model_url": "https://huggingface.co/stabilityai/stable-diffusion-3-medium-diffusers",
+  "slots": [
+    {
+      "id": "model",
+      "required": true
+    },
+    {
+      "id": "vae",
+      "required": false
+    },
+    {
+      "id": "tae",
+      "required": false
+    }
+  ],
+  "defaults": {
+    "sampling_method": "euler",
+    "cfg_scale": 7,
+    "steps": 20,
+    "width": 1024,
+    "height": 1024
+  },
+  "features": [
+    "clip_skip",
+    "flow_shift",
+    "slg"
+  ]
+}