feat: add /files/{file} GET and DELETE methods

design/openapi.yml

@@ -7,7 +7,7 @@ servers:
   - url: http://localhost:8080/api/v1/
     description: local server
 paths:
-  /:
+  /files:
     get:
       summary: "list all uploaded files"
       description: "list all uploaded files"
@@ -18,11 +18,9 @@ paths:
           content:
             text/plain:
               schema:
-                type: array
-                items:
-                  type: string
-                  format: uri
-      
+                type: string
+                format: html
+          
         500:
           description: "internal server error"
           content:
@@ -74,8 +72,9 @@ paths:
             text/plain:
               schema:
                 type: string
+
                 default: "internal server error"
-  /{file_name}:
+  /files/{file_name}:
     get:
       summary: "get file"
       description: "get file"
@@ -135,6 +134,26 @@ paths:
               schema:
                 type: string
                 default: "file not found"
+        500:
+          description: "internal server error"
+          content:
+            text/plain:
+              schema:
+                type: string
+                default: "internal server error"
+  /health:
+    get:
+      summary: "health check"
+      description: "health check"
+      operationId: "health_check"
+      responses:
+        200:
+          description: "health check successful"
+          content:
+            text/plain:
+              schema:
+                type: string
+                default: "health check successful"
         500:
           description: "internal server error"
           content: