add split swagger

docs/swagger.yaml

 openapi: 3.0.4
 info:
   title: Genkit Chat API
-  description: API for interacting with chat and indexing endpoints powered by Genkit.
+  description: API for interacting with chat, indexing, and document splitting endpoints powered by Genkit.
   version: 0.1.0
 paths:
+  /split/document:
+    post:
+      summary: Reconstruct document with Server-Sent Events
+      description: Reconstructs a document from a base64-encoded file for processing, supporting Server-Sent Events (SSE).
+      tags:
+        - Split
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                FileType:
+                  type: string
+                  description: The type of the file to be reconstructed
+                  example: "TXT"
+                FileBase64:
+                  type: string
+                  description: The base64-encoded content of the file
+                  example: "data:application/octet-stream;base64,4oCc6L+Z5bCx6LGh6Iqx5LiA5qC344CC5aaC5p6c5L2g54ix5LiK5LqG5LiA5py155Sf6ZW/IArlnKjkuIDpopfmmJ/mmJ/kuIrnmoToirHvvIzpgqPkuYjlpJzpl7TvvIwgCuS9oOeci+edgOWkqeepuuWwseaEn+WIsOeUnOicnOaEiSAK5b+r44CC5omA5pyJ55qE5pif5pif5LiK6YO9CuWlveixoeW8gOedgOiKseOAguKAnQ=="
+              required:
+                - FileType
+                - FileBase64
+      responses:
+        '200':
+          description: Successful reconstruction of the document with SSE
+          content:
+            text/event-stream:
+              schema:
+                type: string
+                description: Server-Sent Events stream containing the reconstructed document data
+              examples:
+                success:
+                  value: |
+                    data: {"status": "success", "document": "reconstructed content"}
+                    event: message
+                    id: 1
+                    data: {"status": "complete"}
+        '400':
+          description: Invalid input or malformed request
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Response'
+              examples:
+                error:
+                  value:
+                    data: ""
+                    code: 400
+                    msg: "Invalid file type or base64 content"
   /index/document:
     post:
       summary: Store Milvus index data
@@ -174,4 +225,4 @@ components:
       required:
         - data
         - code
-        - msg
\ No newline at end of file
+        - msg