Remove non-functional MAX auto-reaction, add real TG auto-reaction

MAX Bot API has no reaction endpoint (confirmed 404 in production logs),
so drop the dead code path entirely instead of eating a warning every post.

Telegram's setMessageReaction is a real Bot API method (verified against
aiogram 3.21.0, the pinned version) - wire it up as a non-fatal
best-effort call after a successful send, mirroring the same
try/except-and-log pattern MAX already used.

.env.example

@@ -39,9 +39,6 @@ MAX_BOT_TOKEN=your_max_bot_token_here
 MAX_CHAT_ID=123456
 # MAX API Base URL
 MAX_API_BASE_URL=https://platform-api2.max.ru
-# MAX Auto Reaction emoji on published post
-MAX_AUTO_REACTION=👍
-MAX_AUTO_REACTION_ENABLED=true
 
 # ==========================================
 # Polling, Reporting & Maintenance
@@ -83,6 +80,9 @@ FOOTER_TEXT=
 COMMON_TAGS=#redairsoft #страйкбол
 # Make the first line of the post bold
 FORMAT_FIRST_LINE_BOLD=true
+# Telegram auto-reaction emoji on published posts (real Bot API method, unlike MAX)
+TG_AUTO_REACTION=👍
+TG_AUTO_REACTION_ENABLED=true
 
 # Logging Level (DEBUG, INFO, WARNING, ERROR)
 LOG_LEVEL=INFO