Add staff playtime feature, including backend services, API endpoint, and frontend integration.

WIP

open_api/src/main/resources/api.yml

@@ -93,3 +93,5 @@ paths:
     $ref: './schemas/forms/mail/mail.yml#/GetEmails'
   /api/site/vote:
     $ref: './schemas/site/vote.yml#/VoteStats'
+  /api/site/get-staff-playtime/{from}/{to}:
+    $ref: './schemas/site/staff_pt.yml#/GetStaffPlaytime'

open_api/src/main/resources/schemas/site/staff_pt.yml

@@ -0,0 +1,53 @@
+GetStaffPlaytime:
+  get:
+    tags:
+      - site
+    summary: Get staff playtime for a specified duration
+    description: Get staff playtime for all staff members for a specified duration
+    operationId: getStaffPlaytime
+    parameters:
+      - $ref: '#/components/parameters/From'
+      - $ref: '#/components/parameters/To'
+    responses:
+      '200':
+        description: Staff playtime retrieved
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/StaffPlaytimeList'
+components:
+  parameters:
+    From:
+      name: from
+      in: path
+      required: true
+      schema:
+        type: string
+        format: date-time
+        example: 2025-01-01T00:00:00.000Z
+    To:
+      name: to
+      in: path
+      required: true
+      schema:
+        type: string
+        format: date-time
+        example: 2025-01-07T23:59:59.999Z
+  schemas:
+    StaffPlaytimeList:
+      type: array
+      items:
+        $ref: '#/components/schemas/StaffPlaytime'
+    StaffPlaytime:
+      type: object
+      properties:
+        staff_member:
+          type: string
+          description: The name of the staff member
+        playtime:
+          type: integer
+          description: Total playtime for the specified duration in minutes
+        last_played:
+          type: string
+          format: date-time
+          description: Last played timestamp