git_pull_execute: GitHub fallback when GITEA_REPO_PATH is empty

End users leave GITEA_REPO_PATH="" in master.conf (template default).
Before hitting any Gitea detection logic, the script now checks for this
and does git pull --ff-only origin main directly — origin is already
GitHub since the .plg cloned from there.

Sparse checkout skipped on this path: conf files are gitignored so
nothing sensitive is in the repo to exclude.

Developer path (GITEA_REPO_PATH configured) is completely unchanged.

git_pull_execute.sh

@@ -69,6 +69,39 @@ fi
 # detect_hosts() sets MY_ID — needed for sparse checkout configuration
 detect_hosts
 
+# ==============================================================================================
+# ━━━ GitHub path — GITEA_REPO_PATH not configured ━━━
+# ==============================================================================================
+# End users without a self-hosted Gitea leave GITEA_REPO_PATH empty in master.conf.
+# The .plg already cloned from GitHub so origin is already correct — just pull from it.
+# Sparse checkout is not needed: conf files are gitignored and absent from the repo.
+if [[ -z "${GITEA_REPO_PATH:-}" ]]; then
+    echo ""
+    echo "━━━ $ICON_SYNC Git Pull (GitHub) ━━━"
+
+    if [[ ! -d "$TARGET_DIR/.git" ]]; then
+        error "No git repo at $TARGET_DIR — reinstall the plugin to restore it"
+        exit 1
+    fi
+
+    if [[ "$DRY_RUN" == true ]]; then
+        warn "DRY RUN — would: git -C $TARGET_DIR pull --ff-only origin main"
+        exit 0
+    fi
+
+    git config --global --add safe.directory "$TARGET_DIR" 2>/dev/null || true
+
+    if git -C "$TARGET_DIR" pull --ff-only origin main; then
+        echo "  Pull complete ✅"
+        find "$TARGET_DIR" -type f -name "*.sh" -exec chmod +x {} \;
+    else
+        error "Git pull failed — check internet access and GitHub availability"
+        notify "Git pull failed on $(hostname) — check internet / GitHub connectivity" "Git Sync" "alert"
+        exit 1
+    fi
+    exit 0
+fi
+
 # ==============================================================================================
 # ━━━ Locate Gitea ━━━
 # ==============================================================================================