feat(public/openapi): add OpenAPI v3 specifications for admin/federation/analytics and errors routes

Co-authored-by: aider (ollama/qwen2.5-coder:7b) <aider@aider.chat>

public/openapi/read/admin/federation/analytics.yaml

@@ -0,0 +1,45 @@
+get:
+  tags:
+    - admin
+  summary: Get federation analytics data
+  parameters:
+    - name: host
+      in: query
+      description: The hostname to filter analytics for
+      required: false
+      schema:
+        type: string
+    - name: term
+      in: query
+      description: The time period to retrieve analytics for (daily or hourly)
+      required: false
+      schema:
+        type: string
+  responses:
+    "200":
+      description: Analytics data
+      content:
+        application/json:
+          schema:
+            allOf:
+              - type: object
+                properties:
+                  title:
+                    type: string
+                  instances:
+                    type: array
+                    items:
+                      type: string
+                  received:
+                    type: array
+                    items:
+                      $ref: ../../../components/schemas/admin/stats.yaml#/StatsArray
+                  receivedErr:
+                    type: array
+                    items:
+                      $ref: ../../../components/schemas/admin/stats.yaml#/StatsArray
+                  sent:
+                    type: array
+                    items:
+                      $ref: ../../../components/schemas/admin/stats.yaml#/StatsArray
+              - $ref: ../../../components/schemas/CommonProps.yaml#/CommonProps

public/openapi/read/admin/federation/errors.yaml

@@ -0,0 +1,23 @@
+get:
+  tags:
+    - admin
+  summary: Get federation error data
+  responses:
+    "200":
+      description: Error data
+      content:
+        application/json:
+          schema:
+            allOf:
+              - type: object
+                properties:
+                  title:
+                    type: string
+                  hideSave:
+                    type: boolean
+                    description: A flag to instruct the template engine to hide the save button
+                  errors:
+                    type: array
+                    items:
+                      $ref: ../../../components/schemas/admin/error.yaml#/ErrorObject
+              - $ref: ../../../components/schemas/CommonProps.yaml#/CommonProps