swagger post chat

docs/swagger.yaml

 openapi: 3.0.4
 info:
-  title: Sample API
-  description: Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML.
-  version: 0.1.9
-servers:
-  - url: http://api.example.com/v1
-    description: Optional server description, e.g. Main (production) server
-  - url: http://staging-api.example.com
-    description: Optional server description, e.g. Internal staging server for testing
+  title: Genkit Chat API
+  description: API for interacting with a chat endpoint powered by Genkit.
+  version: 0.1.0
 paths:
-  /users:
-    get:
-      summary: Returns a list of users.
-      description: Optional extended description in CommonMark or HTML.
+  /chat:
+    post:
+      summary: Send a chat message
+      description: Sends a chat message to the Genkit AI workflow and returns a response.
+      tags:
+        - Chat
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                content:
+                  type: string
+                  description: The chat message content
+                  example: "What is the capital of UK?"
+                model:
+                  type: string
+                  description: The model to use for the chat response
+                  example: "gpt-3.5-turbo"
+                apiKey:
+                  type: string
+                  description: The API key for authentication
+                  example: "sk-1234567890abcdef"
+                username:
+                  type: string
+                  description: The username of the requester
+                  example: "john_doe"
+                user_id:
+                  type: string
+                  description: The unique identifier for the user
+                  example: "user_12345"
+              required:
+                - content
       responses:
-        "200": # status code
-          description: A JSON array of user names
+        '200':
+          description: Successful response with the chat answer
           content:
             application/json:
               schema:
-                type: array
-                items:
-                  type: string
+                type: object
+                properties:
+                  response:
+                    type: string
+                    description: The response from the chat workflow
+                    example: "The capital of the UK is London."
+        '400':
+          description: Invalid input
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  error:
+                    type: string
+                    description: Error message
+                    example: "Invalid request body"
+components:
+  schemas: {}