Add TrustedProxies configuration to support proxy IPs in Gin

[devld]

Note

Medium Risk
Touches request client-IP determination, which can affect logging and any IP-based controls (e.g., rate limiting) if misconfigured, though the default remains the safer “trust none” behavior.

Overview
Adds a new trusted-proxies config field (YAML trusted-proxies) and documents it in docs/config.yml for deployments behind reverse proxies.

Updates server initialization to apply gin.Engine.SetTrustedProxies from config (or explicitly disable trusting proxy headers when unset), ensuring ClientIP() behavior matches the configured proxy trust model.

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