Merged in feature/download-pdf (pull request #216)

retrieve document by id and tests

* working

* missing files

serviceAPIs/queryAPI.yaml

@@ -645,6 +645,48 @@ paths:
         "500":
           $ref: "#/components/responses/InternalError"
 
+  /document/{id}/download:
+    parameters:
+      - $ref: "#/components/parameters/DocumentID"
+    get:
+      operationId: downloadDocument
+      tags:
+        - DocumentsService
+      summary: Download the original document file
+      description: |
+        Streams the original uploaded document file. The response Content-Type
+        is auto-detected from the stored filename extension. No query parameters
+        are required; the system resolves the file type automatically.
+      security:
+        - jwtAuth: []
+      responses:
+        "200":
+          description: Document file bytes.
+          headers:
+            RateLimit:
+              $ref: "#/components/headers/RateLimit"
+            Content-Disposition:
+              schema:
+                type: string
+                maxLength: 4096
+              description: 'Attachment header with original filename, e.g. attachment; filename="report.pdf"'
+          content:
+            application/octet-stream:
+              schema:
+                type: string
+                format: binary
+                maxLength: 107374182400
+        "400":
+          $ref: "#/components/responses/InvalidRequest"
+        "401":
+          $ref: "#/components/responses/Unauthorized"
+        "404":
+          $ref: "#/components/responses/NotFound"
+        "429":
+          $ref: "#/components/responses/TooManyRequests"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
   /folders:
     post:
       operationId: createFolder