feat: Implement contract checkout payment service and account management UI.

.env.example

@@ -42,6 +42,13 @@ SUPABASE_SUB_CACHE_TTL_SEC=60
 # - Pro entitlement removed
 # - user only needs to be a member of TELEGRAM_CHAT_ID group
 POLYWEATHER_BOT_GROUP_INVITE_URL=
+# Group message points (anti-spam + ranking)
+POLYWEATHER_BOT_MESSAGE_POINTS=4
+POLYWEATHER_BOT_MESSAGE_DAILY_CAP=40
+POLYWEATHER_BOT_MESSAGE_MIN_LENGTH=3
+POLYWEATHER_BOT_MESSAGE_COOLDOWN_SEC=30
+POLYWEATHER_BOT_CITY_QUERY_COST=1
+POLYWEATHER_BOT_DEB_QUERY_COST=1
 # Backend entitlement guard (for /api/cities, /api/city/*, /api/history/*)
 POLYWEATHER_REQUIRE_ENTITLEMENT=false
 POLYWEATHER_BACKEND_ENTITLEMENT_TOKEN=
@@ -64,7 +71,7 @@ POLYWEATHER_PAYMENT_TELEGRAM_NOTIFY_ENABLED=true
 # Default is monthly-only launch.
 POLYWEATHER_PAYMENT_ALLOWED_PLAN_CODES=pro_monthly
 # JSON object
-# Example: {"pro_monthly":{"plan_id":101,"amount_usdc":"29","duration_days":30}}
+# Example: {"pro_monthly":{"plan_id":101,"amount_usdc":"5","duration_days":30}}
 POLYWEATHER_PAYMENT_PLAN_CATALOG_JSON=
 
 # Polymarket P0 Read-Only Market Layer
@@ -122,3 +129,4 @@ POLYMARKET_WALLET_ACTIVITY_UPDATE_DEBOUNCE_SEC=30
 POLYMARKET_WALLET_ACTIVITY_UPDATE_MAX_HOLD_SEC=120
 POLYMARKET_WALLET_ACTIVITY_AVG_PRICE_SHOW_MIN=0.01
 POLYMARKET_WALLET_ACTIVITY_AVG_PRICE_SHOW_MAX=0.99
+