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

examples/server/recipes/flux1-pulid.json

@@ -0,0 +1,56 @@
+{
+  "schema_version": 1,
+  "id": "flux1-pulid",
+  "name": "FLUX.1 dev PuLID",
+  "description": "Supply a precomputed PuLID identity embedding with the generation request.",
+  "model_url": "https://huggingface.co/guozinan/PuLID",
+  "slots": [
+    {
+      "id": "diffusion_model",
+      "required": true
+    },
+    {
+      "id": "clip_l",
+      "required": true
+    },
+    {
+      "id": "t5xxl",
+      "required": true
+    },
+    {
+      "id": "pulid_weights",
+      "required": true
+    },
+    {
+      "id": "vae",
+      "required": false
+    },
+    {
+      "id": "tae",
+      "required": false
+    }
+  ],
+  "required_any": [
+    [
+      "vae",
+      "tae"
+    ]
+  ],
+  "defaults": {
+    "sampling_method": "euler",
+    "cfg_scale": 1,
+    "steps": 20,
+    "width": 1024,
+    "height": 1024,
+    "distilled_guidance": 3.5
+  },
+  "features": [
+    "clip_skip",
+    "distilled_guidance",
+    "flow_shift",
+    "slg"
+  ],
+  "disabled_features": [
+    "slg"
+  ]
+}