feat: add admin point grants and history UI

backend/src/main/java/com/openisle/controller/AdminPointController.java

@@ -0,0 +1,35 @@
+package com.openisle.controller;
+
+import com.openisle.dto.AdminGrantPointRequest;
+import com.openisle.service.PointService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
+import java.util.Map;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/admin/points")
+@RequiredArgsConstructor
+public class AdminPointController {
+
+  private final PointService pointService;
+
+  @PostMapping("/grant")
+  @SecurityRequirement(name = "JWT")
+  @Operation(summary = "Grant points", description = "Grant points to a user as administrator")
+  @ApiResponse(responseCode = "200", description = "Points granted")
+  public Map<String, Object> grant(
+    @RequestBody AdminGrantPointRequest request,
+    Authentication auth
+  ) {
+    String username = request.getUsername();
+    int balance = pointService.grantPointByAdmin(auth.getName(), username, request.getAmount());
+    return Map.of("username", username.trim(), "point", balance);
+  }
+}