Show latest credit ledger in admin

Expose a paginated global ledger timeline and load it automatically so operators can see recent credit activity without first locating a user.

docs/openapi.yaml

@@ -604,6 +604,25 @@ paths:
         "400": { description: Cursor is malformed }
         "403": { description: ANALYST role cannot access credit ledger records }
         "404": { description: User was not found }
+  /v1/admin/credits/ledger:
+    get:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Return the latest immutable credit ledger entries across users
+      parameters:
+        - name: cursor
+          in: query
+          schema: { type: string, maxLength: 256 }
+        - $ref: "#/components/parameters/Limit"
+      responses:
+        "200":
+          description: Latest credit ledger entries ordered by creation time and entry ID
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AdminLedgerPage" }
+        "400": { description: Cursor is malformed }
+        "403": { description: ANALYST role cannot access credit ledger records }
   /v1/admin/credits/grants:
     post:
       security:
@@ -1015,9 +1034,10 @@ components:
     AdminLedgerEntry:
       type: object
       additionalProperties: false
-      required: [entryId, type, amount, balanceAfter, reasonCode, createdAt]
+      required: [entryId, userId, type, amount, balanceAfter, reasonCode, createdAt]
       properties:
         entryId: { type: string, format: uuid }
+        userId: { type: string, format: uuid }
         type: { type: string, enum: [grant, reserve, settle, refund, adjustment] }
         amount: { type: integer, format: int64 }
         balanceAfter: { type: integer, format: int64, minimum: 0 }