Initial stable release

v1.0.0 is the first stable release of gin-limiter, a high-performance rate-limiting middleware for the Gin web framework.
Highlights

• Redis-backed with an atomic Lua script (single round-trip)
• Per-IP / per-endpoint / per-API-key limiting via pluggable key function
• Standard X-RateLimit-* headers + customisable 429 handler
• Zero external dependencies beyond github.com/redis/go-redis/v9