feat: add daily chess puzzle api

src/main/kotlin/me/wypark/blogbackend/api/controller/ChessPuzzleController.kt

@@ -0,0 +1,30 @@
+package me.wypark.blogbackend.api.controller
+
+import me.wypark.blogbackend.api.common.ApiResponse
+import me.wypark.blogbackend.api.dto.ChessPuzzleResponse
+import me.wypark.blogbackend.domain.chess.ChessPuzzleService
+import org.springframework.http.HttpStatus
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@RequestMapping("/api/chess-puzzles")
+class ChessPuzzleController(
+    private val chessPuzzleService: ChessPuzzleService
+) {
+
+    @GetMapping("/today")
+    fun getTodayPuzzle(
+        @RequestParam(defaultValue = "Asia/Seoul") timezone: String
+    ): ResponseEntity<ApiResponse<ChessPuzzleResponse>> {
+        val puzzle = chessPuzzleService.getTodayPuzzle(timezone)
+            ?: return ResponseEntity
+                .status(HttpStatus.NOT_FOUND)
+                .body(ApiResponse("CHESS_PUZZLE_NOT_FOUND", "오늘의 체스 퍼즐이 준비되지 않았습니다.", null))
+
+        return ResponseEntity.ok(ApiResponse.success(puzzle))
+    }
+}

src/main/kotlin/me/wypark/blogbackend/api/dto/ChessPuzzleDtos.kt

@@ -0,0 +1,34 @@
+package me.wypark.blogbackend.api.dto
+
+import me.wypark.blogbackend.domain.chess.ChessPuzzle
+import java.time.LocalDate
+
+data class ChessPuzzleResponse(
+    val id: Long,
+    val date: LocalDate,
+    val title: String,
+    val theme: String,
+    val fen: String,
+    val answer: String,
+    val answerUci: String,
+    val hint: String,
+    val rating: Int,
+    val sourceUrl: String
+) {
+    companion object {
+        fun from(puzzle: ChessPuzzle, date: LocalDate): ChessPuzzleResponse {
+            return ChessPuzzleResponse(
+                id = puzzle.id!!,
+                date = date,
+                title = puzzle.title,
+                theme = puzzle.theme,
+                fen = puzzle.fen,
+                answer = puzzle.answer,
+                answerUci = puzzle.answerUci,
+                hint = puzzle.hint,
+                rating = puzzle.rating,
+                sourceUrl = puzzle.sourceUrl
+            )
+        }
+    }
+}