feat: add retry in init phase instead of panic directly

[zirain]

fixes: #1143

Key Changes:

• Redis Connection Retry Mechanism: Replaces immediate panic on Redis connection failure with exponential backoff retry, validates connection with PING before proceeding.
• Context-Based Initialization: Adds context.Context throughout initialization chain for graceful cancellation, allows shutdown during startup retry phase.
• Health Check Updates: Redis health now starts as unhealthy (was healthy), marked healthy only after successful connection confirmed.