fix: stabilize systemd deployment and release updates

backend/src/main/resources/application-local.yml

@@ -1,3 +1,9 @@
+spring:
+  datasource:
+    url: ${DB_URL}
+    username: ${DB_USERNAME}
+    password: ${DB_PASSWORD}
+
 server:
   servlet:
     session:

backend/src/main/resources/application.yml

@@ -17,11 +17,8 @@ spring:
     resources:
       static-locations: ${FINANCE_STATIC_LOCATIONS:file:./public/}
   profiles:
-    default: local
+    default: production
   datasource:
-    url: ${DB_URL:jdbc:mysql://127.0.0.1:3307/kaidi_finance?useUnicode=true&characterEncoding=utf8&connectionTimeZone=UTC&serverTimezone=UTC}
-    username: ${DB_USERNAME:kaidi}
-    password: ${DB_PASSWORD:kaidi_local_2026}
     hikari:
       maximum-pool-size: 20
       minimum-idle: 2