Feat: tenant llm provider (#14595)

### What problem does this PR solve?

Python implementation of the Go-based model_provider API suite.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: bill <yibie_jingnian@163.com>

api/apps/restful_apis/models_api.py

@@ -0,0 +1,201 @@
+#
+#  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+import logging
+
+from quart import request
+
+from api.apps import login_required
+from api.apps.services import models_api_service
+from api.utils.api_utils import (
+    add_tenant_id_to_kwargs,
+    get_error_argument_result,
+    get_error_data_result,
+    get_result,
+)
+
+
+@manager.route("/models", methods=["GET"])  # noqa: F821
+@login_required
+@add_tenant_id_to_kwargs
+def get_added_models(tenant_id: str):
+    """
+    List tenant all added models.
+    ---
+    tags:
+      - Models
+    security:
+      - ApiKeyAuth: []
+    parameters:
+      - in: header
+        name: Authorization
+        type: string
+        required: true
+        description: Bearer token for authentication.
+    responses:
+      200:
+        description: List of added models.
+        schema:
+          type: object
+          properties:
+            data:
+              type: object
+              properties:
+                models:
+                  type: array
+                  items:
+                    type: object
+                    properties:
+                      model_provider:
+                        type: string
+                      model_instance:
+                        type: string
+                      model_name:
+                        type: string
+                      model_type:
+                        type: string
+                      enable:
+                        type: boolean
+    """
+    model_type_filter = request.args.get("type")
+    try:
+        success, result = models_api_service.list_tenant_added_models(tenant_id, model_type_filter)
+        if success:
+            return get_result(data=result)
+        else:
+            return get_error_data_result(message=result)
+    except Exception as e:
+        logging.exception(e)
+        return get_error_data_result(message="Internal server error")
+
+
+@manager.route("/models/default", methods=["GET"])  # noqa: F821
+@login_required
+@add_tenant_id_to_kwargs
+def get_default_models(tenant_id: str):
+    """
+    List tenant default models.
+    ---
+    tags:
+      - Models
+    security:
+      - ApiKeyAuth: []
+    parameters:
+      - in: header
+        name: Authorization
+        type: string
+        required: true
+        description: Bearer token for authentication.
+    responses:
+      200:
+        description: List of default models.
+        schema:
+          type: object
+          properties:
+            data:
+              type: object
+              properties:
+                models:
+                  type: array
+                  items:
+                    type: object
+                    properties:
+                      model_provider:
+                        type: string
+                      model_instance:
+                        type: string
+                      model_name:
+                        type: string
+                      model_type:
+                        type: string
+                      enable:
+                        type: boolean
+    """
+    try:
+        success, result = models_api_service.list_tenant_default_models(tenant_id)
+        if success:
+            return get_result(data=result)
+        else:
+            return get_error_data_result(message=result)
+    except Exception as e:
+        logging.exception(e)
+        return get_error_data_result(message="Internal server error")
+
+
+@manager.route("/models/default", methods=["PATCH"])  # noqa: F821
+@login_required
+@add_tenant_id_to_kwargs
+async def set_default_models(tenant_id: str):
+    """
+    Set or clear a tenant default model.
+    ---
+    tags:
+      - Models
+    security:
+      - ApiKeyAuth: []
+    parameters:
+      - in: header
+        name: Authorization
+        type: string
+        required: true
+        description: Bearer token for authentication.
+      - in: body
+        name: body
+        description: Model configuration.
+        required: true
+        schema:
+          type: object
+          required:
+            - model_type
+          properties:
+            model_provider:
+              type: string
+              description: Provider name. Required when setting a model; omit to clear.
+            model_instance:
+              type: string
+              description: Instance name. Required when setting a model; omit to clear.
+            model_name:
+              type: string
+              description: Model name. Required when setting a model; omit to clear.
+            model_type:
+              type: string
+              description: "Model type: chat, embedding, rerank, asr, vision, tts, ocr"
+    responses:
+      200:
+        description: Default model updated.
+        schema:
+          type: object
+    """
+    data = await request.get_json()
+    if not data or "model_type" not in data:
+        return get_error_argument_result(message="model_type is required")
+
+    model_provider = data.get("model_provider", "")
+    model_instance = data.get("model_instance", "")
+    model_name = data.get("model_name", "")
+    model_type = data["model_type"]
+
+    try:
+        success, msg = models_api_service.set_tenant_default_models(
+            tenant_id, model_provider, model_instance, model_name, model_type
+        )
+        if success:
+            logging.info(f"success: {success}, msg: {msg}")
+            return get_result(message=msg)
+        else:
+            return get_error_data_result(message=msg)
+    except Exception as e:
+        logging.exception(e)
+        return get_error_data_result(message="Internal server error")