chore: deduplicate compose environment blocks

Use YAML anchor x-app-env for the shared worker/web environment vars.

Co-authored-by: Cursor <cursoragent@cursor.com>

compose.yml

@@ -8,14 +8,7 @@
 # Syncthing itself runs on the host (not in this compose). Copy .env.example
 # to .env for local overrides (e.g. DATA_HOST_DIR=./data). Never commit .env.
 
-services:
-  worker:
-    build: .
-    restart: unless-stopped
-    # Same UID as Syncthing (PUID=1002) so shared /data stays writable.
-    user: "1002:1002"
-    command: ["python3", "-m", "app.worker"]
-    environment:
+x-app-env: &app-env
   DATA_DIR: /data
   OUTPUT_COUNT: ${OUTPUT_COUNT:-3}
   BLEND_OPACITY: ${BLEND_OPACITY:-30%}
@@ -28,6 +21,16 @@ services:
   REMBG_MODEL: ${REMBG_MODEL:-u2net}
   REMBG_ALPHA: ${REMBG_ALPHA:-1}
   NICE_LEVEL: ${NICE_LEVEL:-18}
+
+services:
+  worker:
+    build: .
+    restart: unless-stopped
+    # Same UID as Syncthing (PUID=1002) so shared /data stays writable.
+    user: "1002:1002"
+    command: ["python3", "-m", "app.worker"]
+    environment:
+      <<: *app-env
     volumes:
       - ${DATA_HOST_DIR:-/home/frank/sync.schwenk.online/data/livef12}:/data
       - ./assets:/data/assets:ro
@@ -48,18 +51,7 @@ services:
     depends_on:
       - worker
     environment:
-      DATA_DIR: /data
-      OUTPUT_COUNT: ${OUTPUT_COUNT:-3}
-      BLEND_OPACITY: ${BLEND_OPACITY:-30%}
-      BLEND_OPACITY_MIN: ${BLEND_OPACITY_MIN:-10}
-      BLEND_OPACITY_MAX: ${BLEND_OPACITY_MAX:-50}
-      FILTER_TIMEOUT: ${FILTER_TIMEOUT:-120}
-      FILTER_TIMEOUT_LONG: ${FILTER_TIMEOUT_LONG:-300}
-      MAX_FILTER_ATTEMPTS: ${MAX_FILTER_ATTEMPTS:-8}
-      MAX_EDGE_PX: ${MAX_EDGE_PX:-2000}
-      REMBG_MODEL: ${REMBG_MODEL:-u2net}
-      REMBG_ALPHA: ${REMBG_ALPHA:-1}
-      NICE_LEVEL: ${NICE_LEVEL:-18}
+      <<: *app-env
       SITE_TITLE: live.f12.rocks
     volumes:
       - ${DATA_HOST_DIR:-/home/frank/sync.schwenk.online/data/livef12}:/data