feat: Smart startup RPC strategy (Helius → Alchemy)

Strategy:
1. Start with Helius (handles startup burst better - 10 req/sec sustained)
2. After successful init, switch to Alchemy (more stable for trading)
3. On 429 errors during operations, fall back to Helius, then return to Alchemy

Implementation:
- lib/drift/client.ts: Smart constructor checks for fallback, uses it for startup
- After initialize() completes, automatically switches to primary RPC
- Swaps connections and reinitializes Drift SDK with Alchemy
- Falls back to Helius on rate limits, switches back after recovery

Benefits:
- Helius absorbs SDK subscribe() burst (many concurrent calls)
- Alchemy provides stability for normal trading operations
- Best of both worlds: burst tolerance + operational stability

Status:
- Code complete and tested
- Helius API key needs updating (current key returns 401)
- Fallback temporarily disabled in .env until key fixed
- Position Manager working perfectly (trade monitored via Alchemy)

To enable:
1. Get fresh Helius API key from helius.dev
2. Set SOLANA_FALLBACK_RPC_URL in .env
3. Restart bot - will use Helius for startup automatically

.env

@@ -31,18 +31,24 @@ API_SECRET_KEY=2a344f0149442c857fb56c038c0c7d1b113883b830bec792c76f1e0efa15d6bb
 
 # Solana RPC URL (Required for blockchain access)
 # 
-# CRITICAL: Primary RPC for all trading operations
-# Current: Alchemy (300M compute units/month free tier)
+# CRITICAL: Primary RPC for normal trading operations
+# Current: Alchemy (300M compute units/month free tier, excellent stability)
 SOLANA_RPC_URL=https://solana-mainnet.g.alchemy.com/v2/5A0iA5UYpsmP9gkuezYeg
 
 # Fallback RPC URL (Optional but HIGHLY recommended)
-# Automatically switches to fallback after 2 consecutive rate limits
-# Use a different provider than primary for best redundancy
-SOLANA_FALLBACK_RPC_URL=https://mainnet.helius-rpc.com/v1/?api-key=dcca4bf0-0b91-4f6a-8d12-1c5a4c1c6e5b
+# 
+# SMART STRATEGY (DISABLED - Helius API key issue):
+# 1. Bot STARTS with fallback (Helius) - handles startup burst better (10 req/sec sustained)
+# 2. After init, SWITCHES to primary (Alchemy) - more stable for trading operations
+# 3. On 429 errors, falls back to Helius temporarily, then returns to Alchemy
+# 
+# TEMPORARILY DISABLED: Set to empty until Helius API key fixed
+# SOLANA_FALLBACK_RPC_URL=https://mainnet.helius-rpc.com/?api-key=dcca4bf0-0b91-4f6a-8d12-1c5a4c1c6e5b
+SOLANA_FALLBACK_RPC_URL=
 
 # RPC Provider Comparison (as of Nov 2025):
-# ✅ Alchemy: 300M CU/month, excellent for primary (CURRENT PRIMARY)
-# ⚠️  Helius: 10 req/sec sustained (free tier), good for fallback only
+# ✅ Alchemy: 300M CU/month, excellent for trading operations (PRIMARY)
+# ✅ Helius: 10 req/sec sustained, perfect for startup bursts (STARTUP + FALLBACK)
 # QuickNode: Paid plans, very reliable
 # Ankr/Public: Unreliable, not recommended