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/iopaint.sh

@@ -47,6 +47,21 @@ 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; }
@@ -194,15 +209,22 @@ install_iopaint() {
     log_info "Installing IOPaint..."
 
     local IOPAINT_DIR="$DOCKER_DIR/iopaint"
+    local WEB_PORT="8100"
 
     if [ "$DRY_RUN" = true ]; then
         echo "[DRY-RUN] Would create $IOPAINT_DIR"
         echo "[DRY-RUN] Would prompt for model and GPU (CUDA) support"
         echo "[DRY-RUN] Would write docker-compose.yml and .env"
+        echo "[DRY-RUN] Would auto-scan for a free host port"
         echo "[DRY-RUN] Would offer Authelia SSO"
         return 0
     fi
 
+    # Scan for a free host port — 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 "$WEB_PORT"
+
     mkdir -p "$IOPAINT_DIR"
     ensure_docker_dir_ownership "$IOPAINT_DIR"
     cd "$IOPAINT_DIR" || return 1
@@ -308,7 +330,7 @@ services:
       --port=8080
       --host=0.0.0.0
     ports:
-      - "8100:8080"
+      - "${WEB_PORT}:8080"
     env_file: .env
     volumes:
       - ./models:/root/.cache
@@ -340,7 +362,7 @@ services:
       --port=8080
       --host=0.0.0.0
     ports:
-      - "8100:8080"
+      - "${WEB_PORT}:8080"
     env_file: .env
     volumes:
       - ./models:/root/.cache
@@ -467,6 +489,12 @@ docker compose pull && docker compose down && docker compose up -d
 - input/, output/    — optional file staging
 MD
 
+    # The README above is a quoted (non-interpolating) heredoc — dense with
+    # literal backticks for inline code spans, too risky to convert to an
+    # interpolating heredoc without escaping every one of them. Patch the
+    # port in afterward instead when it was scanned away from the default.
+    [ "$WEB_PORT" != "8100" ] && sed -i "s/localhost:8100/localhost:${WEB_PORT}/g" "$IOPAINT_DIR/README.md"
+
     local START_IO=""
     prompt_yn "Start IOPaint now? (y/n):" "y" START_IO
     if [ "$START_IO" = "y" ] || [ "$START_IO" = "Y" ]; then
@@ -476,7 +504,7 @@ MD
     fi
 
     echo ""
-    echo "  URL:      http://localhost:8100"
+    echo "  URL:      http://localhost:${WEB_PORT}"
     echo "  Model:    $IOPAINT_MODEL"
     echo "  Device:   $DEVICE_VAL"
     echo "  Switch:   edit MODEL= in $IOPAINT_DIR/.env and restart"