chore: STAGING_PATH entfernt, ci-starter-defaults für Template-Staging

- STAGING_PATH aus .env und Makefile (media-sync-local-to-staging) entfernt, Doku bereinigt
- scripts/ci-starter-defaults.sh löst __PLACEHOLDER__ im CI-Workspace auf, dev/master bleiben identisch

scripts/ci-starter-defaults.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# CI helper: resolve starter placeholders for staging.
+# Called from .gitea/workflows/deploy.yml (before validate/build).
+# Keeps placeholders in git (template), patches .env in CI workspace only.
+#
+# Detection: PROJECT_NAME=__PROJECT_NAME__ or TIBI_NAMESPACE=__TIBI_NAMESPACE__
+# Real projects: no-op (already concrete values).
+
+# shellcheck disable=SC1091
+set -o allexport
+# shellcheck disable=SC1091
+. ./.env 2>/dev/null || true
+set +o allexport
+
+is_starter="false"
+if [ "${PROJECT_NAME:-}" = "__PROJECT_NAME__" ]; then
+    is_starter="true"
+fi
+if [ "${TIBI_NAMESPACE:-}" = "__TIBI_NAMESPACE__" ]; then
+    is_starter="true"
+fi
+
+if [ "${is_starter}" != "true" ]; then
+    echo "ci-starter-defaults: real project (PROJECT_NAME=${PROJECT_NAME:-?}), nothing to do."
+    exit 0
+fi
+
+echo "ci-starter-defaults: starter detected, patching .env for CI workspace only."
+
+PROJECT_NAME="tibi-svelte-starter"
+TIBI_NAMESPACE="tibi-svelte-starter"
+SENTRY_PROJECT="tibi-svelte-starter"
+STAGING_URL="https://dev-tibi-svelte-starter.staging.testversion.online"
+CODING_URL="https://tibi-svelte-starter.code.testversion.online"
+CODING_TIBIADMIN_URL="https://tibi-svelte-starter-tibiadmin.code.testversion.online"
+# Build uses LIVE_URL as originURL/PREVIEW_URL base — point it at staging for the starter
+LIVE_URL="${STAGING_URL}"
+
+patch_env() {
+    key="$1"
+    val="$2"
+    if grep -q "^${key}=" .env; then
+        sed -i 's#^'"${key}"'=.*#'"${key}"'='"${val}"'#g' .env
+    else
+        printf '%s=%s\n' "${key}" "${val}" >> .env
+    fi
+}
+
+patch_env "PROJECT_NAME" "${PROJECT_NAME}"
+patch_env "TIBI_NAMESPACE" "${TIBI_NAMESPACE}"
+patch_env "SENTRY_PROJECT" "${SENTRY_PROJECT}"
+patch_env "STAGING_URL" "${STAGING_URL}"
+patch_env "CODING_URL" "${CODING_URL}"
+patch_env "CODING_TIBIADMIN_URL" "${CODING_TIBIADMIN_URL}"
+patch_env "LIVE_URL" "${LIVE_URL}"
+
+echo "______ .env (starter-resolved) ______"
+cat .env