v2.4.0 — internationalization (EN/RU) + custom git templates

- i18n engine (lib/i18n.sh, lib/lang/en.sh, lib/lang/ru.sh)
- first-run language picker, persisted to .language + config.json
- install.sh, common.sh, backup.sh, templates_catalog.sh wired through t()/tf()
- backup.sh preserves .language marker and records language in metadata.json
- custom git template feature (first item in pro template picker)
  * validates HTTPS URLs, rejects shell metachars
  * 100MB size guard, 90s clone timeout
  * auto-detects index.html in dist/public/build/_site/site/docs/out/www
- bot v2.4.0: i18n.py + lang/{en,ru}.json, /lang command, language toggle button
- bot: custom git template via text input with waiter gating

bootstrap.sh

@@ -6,9 +6,11 @@ set -euo pipefail
 
 REPO="anten-ka/gotelegram_pro"
 BRANCH="${GOTELEGRAM_BRANCH:-test}"
-PAT="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"
+PAT="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"
 INSTALL_DIR="/opt/gotelegram"
-API="https://api.github.com/repos/${REPO}/contents"
+# Use raw.githubusercontent.com (CDN) — faster and avoids Contents API caching
+# issues that occasionally return 404 for recently added files on non-default branches.
+RAW="https://raw.githubusercontent.com/${REPO}/${BRANCH}"
 
 RED='\033[0;31m'
 GREEN='\033[0;32m'
@@ -47,17 +49,20 @@ download_file() {
     dir=$(dirname "$local_path")
     mkdir -p "$dir"
 
-    local http_code
-    http_code=$(curl -sL -w "%{http_code}" -o "$local_path" \
-        -H "Authorization: token ${PAT}" \
-        -H "Accept: application/vnd.github.raw" \
-        "${API}/${remote_path}?ref=${BRANCH}")
+    # Retry up to 3 times with short backoff to tolerate transient CDN hiccups
+    local attempt http_code
+    for attempt in 1 2 3; do
+        http_code=$(curl -sL -w "%{http_code}" -o "$local_path" \
+            -H "Authorization: token ${PAT}" \
+            "${RAW}/${remote_path}")
+        if [ "$http_code" = "200" ]; then
+            return 0
+        fi
+        sleep 1
+    done
 
-    if [ "$http_code" != "200" ]; then
-        echo -e "  ${RED}✗${NC} Ошибка загрузки ${remote_path} (HTTP ${http_code})"
-        return 1
-    fi
-    return 0
+    echo -e "  ${RED}✗${NC} Ошибка загрузки ${remote_path} (HTTP ${http_code})"
+    return 1
 }
 
 # File list