Make the listen port configurable via PORT

app.py's dev server and gunicorn both hardcoded 5000, which is awkward
locally — macOS ControlCenter already holds that port, so the app can't
bind on the dev laptop without editing source.

Both now read PORT, defaulting to 5000 so EXPOSE, the compose
`${HOST_PORT}:5000` mapping and the deployed container are unchanged.
Read at run time rather than import time so a dev harness can assign a
free port.

Also tracks .claude/launch.json with autoPort set. It doesn't actually
launch on this machine — the preview sandbox can't read files under
~/Desktop — so CLAUDE.md notes that running from a shell with an
explicit PORT is the working local path.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.claude/launch.json

@@ -0,0 +1,12 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "arr-summary",
+      "runtimeExecutable": "python3",
+      "runtimeArgs": ["app.py"],
+      "port": 5000,
+      "autoPort": true
+    }
+  ]
+}

CLAUDE.md

@@ -143,6 +143,16 @@ reload alone will silently serve the cached template. And the login
 password comes from `LOGIN_PASSWORD`, so set it explicitly rather than
 hunting for the real one.
 
+The listen port comes from `PORT` (default `5000`, matching `EXPOSE`,
+`gunicorn.conf.py` and the `${HOST_PORT}:5000` compose mapping — change
+all four together or none). Set it when running locally: macOS
+`ControlCenter` already holds port 5000, so `python3 app.py` with no
+`PORT` will fail to bind on the dev laptop. `.claude/launch.json` sets
+`autoPort` so a dev harness can assign a free one, but note that on this
+machine the preview sandbox can't read files under `~/Desktop`
+("Operation not permitted"), so launching by name fails and running the
+app from a shell on an explicit `PORT` is the working path.
+
 ## Deployment
 
 **Target:** Unraid server, container path `/mnt/user/appdata/greendale`

app.py

@@ -1543,4 +1543,8 @@ def add_to_sonarr():
 
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=5000)
+    # PORT is read at run time, not import time, so a dev harness can hand us
+    # a free port. Defaults to 5000 to match EXPOSE/gunicorn and the
+    # `${HOST_PORT}:5000` mapping in docker-compose.yml — don't change the
+    # default without changing all three.
+    app.run(host="0.0.0.0", port=int(os.environ.get("PORT", "5000")))

gunicorn.conf.py

@@ -1,8 +1,12 @@
 # Gunicorn configuration
+import os
+
 workers = 2       # 2 workers × 4 threads = 8 concurrent requests; fewer cold-cache workers
 threads = 4
 worker_class = "gthread"
-bind = "0.0.0.0:5000"
+# Defaults to 5000 to match EXPOSE, the `${HOST_PORT}:5000` mapping in
+# docker-compose.yml, and app.py's own dev-server default.
+bind = "0.0.0.0:" + os.environ.get("PORT", "5000")
 timeout = 30      # fail fast — app has its own 5s internal deadline
 keepalive = 5