feat: rename app to Last Signal

Rename service, UI, storage, and target-path configuration; clarify expiration cleanup behavior.

docker-compose.yml

@@ -1,11 +1,11 @@
 services:
-  collection-keeper:
+  last-signal:
     build: .
-    image: collection-keeper:latest
-    container_name: collection-keeper
+    image: last-signal:latest
+    container_name: last-signal
     restart: unless-stopped
     ports:
-      - "40100:40100"
+      - "44092:44092"
     environment:
       TZ: Asia/Seoul
       THRESHOLD_DAYS: 90
@@ -13,10 +13,10 @@ services:
       # THRESHOLD_SECONDS: 10
       COOLDOWN_SECONDS: 1
       CHECK_INTERVAL_SECONDS: 60
-      PORT: 40100
-      DATABASE_PATH: /data/keeper.sqlite
+      PORT: 44092
+      DATABASE_PATH: /data/last-signal.sqlite
       TRIGGER_SCRIPT: /scripts/cleanup.sh
-      COLLECTION_PATH: /home/zenn/Collection
+      TARGET_PATH: /home/zenn/Collection
       BACKGROUND: random
       RESET_TOKEN: ${RESET_TOKEN:?Set RESET_TOKEN in .env}
       PUBLIC_BASE_URL: ${PUBLIC_BASE_URL:-https://collection.sori.studio}
@@ -26,11 +26,11 @@ services:
       MAIL_TO: ${MAIL_TO:-zenn.message@gmail.com}
       MAIL_CONFIRM_TOKEN: ${MAIL_CONFIRM_TOKEN:-}
     volumes:
-      - keeper-data:/data
+      - last-signal-data:/data
       - ./config/default.json:/app/config/default.json:ro
       - ./scripts:/scripts:ro
       - ./assets/backgrounds:/app/assets/backgrounds:ro
       - /home/zenn/Collection:/home/zenn/Collection
 
 volumes:
-  keeper-data:
+  last-signal-data: