fix: defensive ServiceProvider (class_exists guards), fixed install.sh apply_patch logic

install.sh

@@ -133,15 +133,22 @@ apply_patch() {
     local REPLACE="$3"
     local LABEL="$4"
 
-    if grep -qF "$SEARCH" "$FILE"; then
+    # Check if the injected content is already present (not the anchor)
+    if grep -qF "$REPLACE" "$FILE"; then
         warn "Patch '${LABEL}' already applied — skipping."
         return 0
     fi
-    if ! grep -qF "$REPLACE" "$FILE"; then
-        # Use python for reliable multiline sed (available on most Linux)
-        python3 -c "
+
+    if ! grep -qF "$SEARCH" "$FILE"; then
+        warn "Anchor '${SEARCH}' not found in ${FILE} — skipping patch '${LABEL}'."
+        return 0
+    fi
+
+    python3 -c "
 import sys
 content = open('$FILE').read()
+if '''$REPLACE''' in content:
+    sys.exit(0)
 if '''$SEARCH''' not in content:
     sys.stderr.write('WARN: anchor not found in $FILE\n')
     sys.exit(0)
@@ -149,7 +156,6 @@ content = content.replace('''$SEARCH''', '''$SEARCH\n$REPLACE''', 1)
 open('$FILE','w').write(content)
 "
         success "Patch applied: ${LABEL}"
-    fi
 }
 
 # Patch 1: AppServiceProvider — register addon