refactor: http interfaces (#114)

* implement custom http handler interface

* implement trace_id

* normalize http method spacing for consistent logs

* fix failing test

* fix linter errors

* cleanup old dead code

* more route cleanup

* cleanup some inconsistent errors

* update and generate code

* make taskfile more consistent

* update task calls

* run tidy

* drop `@` tag for version

* use relative paths

* tidy

* fix auto-setting variables

* update build paths

* add contributing guide

* tidy

backend/app/api/static/docs/swagger.yaml

@@ -394,6 +394,15 @@ definitions:
       name:
         type: string
     type: object
+  server.ErrorResponse:
+    properties:
+      error:
+        type: string
+      fields:
+        additionalProperties:
+          type: string
+        type: object
+    type: object
   server.Result:
     properties:
       details: {}
@@ -407,13 +416,6 @@ definitions:
     properties:
       items: {}
     type: object
-  server.ValidationError:
-    properties:
-      field:
-        type: string
-      reason:
-        type: string
-    type: object
   services.UserRegistration:
     properties:
       email:
@@ -708,9 +710,7 @@ paths:
         "422":
           description: Unprocessable Entity
           schema:
-            items:
-              $ref: '#/definitions/server.ValidationError'
-            type: array
+            $ref: '#/definitions/server.ErrorResponse'
       security:
       - Bearer: []
       summary: imports items into the database