Bake cross-service port collision avoidance into every service script

With 70+ services sharing a handful of common default ports (emby and
jellyfin both default to 8096, changedetection and frigate both default
to 5000, arm and nextcloud both default to 8080...), nothing previously
checked whether a service's default port was actually free on the host.
Whichever service installed second would silently write a compose file
claiming an already-held port, only failing at `docker compose up` time.

Adds two shared helpers to lib/common.sh:
- port_in_use PORT [PROTO] — true if something's already listening
- find_free_port VARNAME START [PROTO] — scans upward, writes back the
  first free port

Every service that publishes a fixed host port now scans before writing
docker-compose.yml, on every install (not just when adding an explicit
additional instance). On a normal single-install host this is a silent
no-op; it only changes behavior when something else already holds the
port.

- The 19 services already given multi-instance support this session had
  their port scan moved out of the "add instance" branch to run
  unconditionally, since the same collision risk exists on a plain first
  install.
- 20 more services with previously-hardcoded ports gained scanning for
  the first time: archivebox, arm, calibre-web, changedetection,
  drum-rhythm-game, gatus, n8n, nextcloud, onlyoffice, stirling-pdf,
  uptimekuma, portainer, iopaint (both GPU/CPU compose branches), koha
  (paired), syncthing (paired), wg-easy (paired, plus WG_PORT env so
  generated peer configs keep the right Endpoint), homeassistant
  (bridge-mode only — host mode can only warn), frigate and
  frigate-audio (multi-port stacks, moved together).
- caddy.sh is the deliberate exception: 80/443 stay fixed and only warn
  on collision, since silently moving Caddy itself would leave nothing
  listening where any client actually looks.
- authelia.sh needs no change — it has no published host port at all.
- Every service's standalone bootstrap fallback (sudo bash services/x.sh
  with no sibling files) got the same two helpers duplicated into its
  stub block, matching how every other shared helper is already handled
  there.

Documents the full pattern in CLAUDE.md's new "Port collision avoidance"
section, including the quoted-heredoc/backtick-escaping gotcha and the
network_mode:host limitation (can only scan ports the app takes as a
configurable env var).

Verified via bash -n on every changed file, plus functional runs seeding
occupied ports for each collision shape used here (single, paired,
multi-port stacks) and confirming the scan/shift and generated
compose/README output are correct — including the emby/jellyfin,
nextcloud/arm, and frigate/changedetection collision scenarios that
originally motivated this.

services/drum-rhythm-game.sh

@@ -42,6 +42,21 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
             chown -R "$ACTUAL_USER:$ACTUAL_USER" "$@" 2>/dev/null || true
         }
 
+        port_in_use() {
+            local _port="$1" _proto="${2:-tcp}"
+            local _flag="-tlnH"
+            [ "$_proto" = "udp" ] && _flag="-ulnH"
+            ss "$_flag" "sport = :${_port}" 2>/dev/null | grep -q .
+        }
+
+        find_free_port() {
+            local _varname="$1" _port="$2" _proto="${3:-tcp}"
+            while port_in_use "$_port" "$_proto"; do
+                _port=$((_port + 1))
+            done
+            eval "$_varname='$_port'"
+        }
+
         prompt_text() {
             local _q="$1" _def="$2" _var="$3" _r
             [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
@@ -187,15 +202,23 @@ install_drum-rhythm-game() {
 
     local DRUM_DIR="$DOCKER_DIR/drum-rhythm-game"
     local REPO_URL="https://github.com/outis1one/drum-rhythm-game.git"
+    local WEB_PORT="8096"
 
     if [ "$DRY_RUN" = true ]; then
         echo "[DRY-RUN] drum-rhythm-game would:"
         echo "  - Clone $REPO_URL to $DRUM_DIR/html"
         echo "  - Build the repo's own Dockerfile (nginx, gzip, /healthz) on port 8096"
+        echo "    (auto-scanned for a free host port — 8096 is also emby/jellyfin's default)"
         echo "  - Offer Authelia SSO protection via Caddy (no built-in auth)"
         return 0
     fi
 
+    # Scan for a free host port — this default (8096) is also emby's and
+    # jellyfin's default, so a plain install shouldn't silently claim a port
+    # another already-running service holds. See CLAUDE.md's "Port collision
+    # avoidance" section.
+    find_free_port WEB_PORT "$WEB_PORT"
+
     mkdir -p "$DRUM_DIR"
     ensure_docker_dir_ownership "$DRUM_DIR"
     cd "$DRUM_DIR" || return 1
@@ -248,7 +271,7 @@ services:
     hostname: drum-rhythm-game
     restart: unless-stopped
     ports:
-      - "8096:80"
+      - "${WEB_PORT}:80"
 ${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION}
 DRUM_COMPOSE
 
@@ -268,7 +291,7 @@ DRUM_ENV
     fi
     configure_caddy_for_service "Drum Rhythm Game" "drum-rhythm-game:80" "drums" "$DRUM_EXTRA_BLOCK"
 
-    write_readme "$DRUM_DIR" << 'MD'
+    write_readme "$DRUM_DIR" << MD
 # Drum Rhythm Game
 
 Browser-based drum rhythm game — 18 genres covering 119 synth-orchestra
@@ -281,36 +304,36 @@ Multiplayer take-turns mode, adjustable speed/volume, and a leaderboard —
 all state lives in browser localStorage. No server required; all audio is
 synthesized in-browser via the Web Audio API.
 
-Built and served from the repo's own `Dockerfile` (nginx + gzip + a
-`/healthz` endpoint) — only `index.html` ends up in the image, so the
+Built and served from the repo's own \`Dockerfile\` (nginx + gzip + a
+\`/healthz\` endpoint) — only \`index.html\` ends up in the image, so the
 repo's docs/license/dev files never get served.
 
 Source: https://github.com/outis1one/drum-rhythm-game
 
 ## Access
-- URL: http://localhost:8096
+- URL: http://localhost:${WEB_PORT}
 
 ## Manage
-```bash
+\`\`\`bash
 cd ~/docker/drum-rhythm-game
 docker compose up -d      # start
 docker compose down       # stop
 docker compose logs -f    # logs
-```
+\`\`\`
 
 ## Update game
-```bash
+\`\`\`bash
 cd ~/docker/drum-rhythm-game
 git -C html pull
 docker compose up -d --build
-```
+\`\`\`
 MD
 
     local START_DRUM=""
     prompt_yn "Start drum-rhythm-game now? (y/n):" "y" START_DRUM
     if [ "$START_DRUM" = "y" ] || [ "$START_DRUM" = "Y" ]; then
         docker compose up -d --build \
-            && log_success "Drum Rhythm Game started — http://localhost:8096" \
+            && log_success "Drum Rhythm Game started — http://localhost:${WEB_PORT}" \
             || log_warning "Start failed — check: docker compose logs"
     fi