feature: public -> private api

app/api.py

@@ -5,7 +5,8 @@
 from app.auth.router import router as auth_router
 from app.core.router import create_router
 from app.features.router import router as features_router
-from app.grad_2025.router import router as grad_2025_router
+from app.grad_2025.router import private_router as grad_2025_private_router
+from app.grad_2025.router import public_router as grad_2025_public_router
 from app.posts.router import router as posts_router
 from app.tags.router import router as tags_router
 from app.users.router import router as users_router
@@ -15,7 +16,9 @@
 public_router = create_router(prefix="/public")
 public_router.include_router(auth_router, prefix="/auth", tags=["Auth"])
 public_router.include_router(features_router, prefix="/features", tags=["Features"])
-public_router.include_router(grad_2025_router, prefix="/grad_2025", tags=["Grad 2025"])
+public_router.include_router(
+    grad_2025_public_router, prefix="/grad_2025", tags=["Grad 2025"]
+)
 
 private_router = create_router(
     prefix="/private",
@@ -25,6 +28,9 @@
 private_router.include_router(posts_router, prefix="/posts", tags=["Posts"])
 private_router.include_router(tags_router, prefix="/tags", tags=["Tags"])
 private_router.include_router(admin_router, prefix="/admin", tags=["Admin"])
+private_router.include_router(
+    grad_2025_private_router, prefix="/grad-2025", tags=["Grad 2025"]
+)
 
 router.include_router(public_router)
 router.include_router(private_router)

app/grad_2025/router.py

@@ -10,17 +10,30 @@
 from .schemas import Grad2025Cursor, Grad2025Read
 from .service import Grad2025Service
 
-router = create_router()
+# Public router - 학교/전공 목록 (기존 배포된 API)
+public_router = create_router()
 
 
-@router.get("")
+@public_router.get("", deprecated=True)
 async def read_univ_majors(
     grad_2025_service: Grad2025Service,
 ) -> list[Grad2025Read]:
+    """Deprecated: /private/grad-2025/univ-majors 를 사용하세요."""
     return await grad_2025_service.get_univ_majors()
 
 
-@router.get("/posts")
+# Private router - 졸업작품 관련 API (인증 필요)
+private_router = create_router()
+
+
+@private_router.get("/univ-majors")
+async def read_univ_majors_private(
+    grad_2025_service: Grad2025Service,
+) -> list[Grad2025Read]:
+    return await grad_2025_service.get_univ_majors()
+
+
+@private_router.get("/posts")
 async def search_grad_2025_posts(
     grad_2025_service: Grad2025Service,
     cursor: Annotated[