Fix standalone Docker Compose mode: fallback to bashio-standalone when no Supervisor

- ha_entrypoint.sh: probe_script_content now tries regular bashio first,
  falls back to bashio-standalone.sh if Supervisor API unreachable
- 00-banner.sh: source bashio-standalone before calling bashio functions
  in standalone branch (prevents undefined function errors with set -e)
- 01-custom_script.sh: same probe fix + add bashio-standalone.sh to
  fallback source chain

Co-authored-by: alexbelgium <44178713+alexbelgium@users.noreply.github.com>

.templates/00-banner.sh

@@ -7,12 +7,15 @@ set -e
 # ======================================================================
 
 if ! bashio::supervisor.ping 2>/dev/null; then
+    # Source standalone bashio first to provide function definitions
+    if [ -f /usr/local/lib/bashio-standalone.sh ]; then
+        source /usr/local/lib/bashio-standalone.sh
+    fi
     bashio::log.blue '-----------------------------------------------------------'
     bashio::log.blue "Starting addon in standalone mode (no Supervisor)"
     bashio::log.blue "Version : ${BUILD_VERSION:-1.0}"
     bashio::log.blue "Config source: ENV + /data/options.json"
     bashio::log.blue '-----------------------------------------------------------'
-    source /usr/local/lib/bashio-standalone.sh
     cp -rf /usr/local/lib/bashio-standalone.sh /usr/bin/bashio
     grep -rlZ "^#!.*bashio" /etc |
     while IFS= read -r -d '' f; do

.templates/01-custom_script.sh

@@ -64,7 +64,20 @@ if ! command -v bashio::addon.version >/dev/null 2>&1; then
   done
 fi
 
-bashio::addon.version
+# Try regular bashio, fallback to standalone if unavailable or fails
+set +e
+_bv="$(bashio::addon.version 2>/dev/null)"
+_rc=$?
+set -e
+
+if [ "$_rc" -ne 0 ] || [ -z "$_bv" ] || [ "$_bv" = "null" ]; then
+  if [ -f /usr/local/lib/bashio-standalone.sh ]; then
+    . /usr/local/lib/bashio-standalone.sh
+    _bv="$(bashio::addon.version)"
+  fi
+fi
+
+echo "$_bv"
 '
 
 validate_shebang() {
@@ -133,7 +146,7 @@ fi
 sed -i "1s|^.*|#!$shebang|" "$0"
 
 if ! command -v bashio::addon.version >/dev/null 2>&1; then
-  for f in /usr/lib/bashio/bashio.sh /usr/lib/bashio/lib.sh /usr/src/bashio/bashio.sh /usr/local/lib/bashio/bashio.sh; do
+  for f in /usr/lib/bashio/bashio.sh /usr/lib/bashio/lib.sh /usr/src/bashio/bashio.sh /usr/local/lib/bashio/bashio.sh /usr/local/lib/bashio-standalone.sh; do
     if [ -f "$f" ]; then
       # shellcheck disable=SC1090
       . "$f"

.templates/ha_entrypoint.sh

@@ -83,7 +83,21 @@ if ! command -v bashio::addon.version >/dev/null 2>&1; then
   done
 fi
 
-bashio::addon.version
+# Try regular bashio, fallback to standalone if unavailable or fails
+set +e
+_bv="$(bashio::addon.version 2>/dev/null)"
+_rc=$?
+set -e
+
+if [ "$_rc" -ne 0 ] || [ -z "$_bv" ] || [ "$_bv" = "null" ]; then
+  if [ -f /usr/local/lib/bashio-standalone.sh ]; then
+    # shellcheck disable=SC1091
+    . /usr/local/lib/bashio-standalone.sh
+    _bv="$(bashio::addon.version)"
+  fi
+fi
+
+echo "$_bv"
 '
 
 validate_shebang() {