Organize config examples: move config*.toml to examples/ directory

examples/README.md

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+# HMAC File Server Configuration Examples
+
+This directory contains example configuration files for various deployment scenarios.
+
+## Available Configurations
+
+- **config-enhanced-security.toml** - Security-hardened configuration with enhanced authentication
+- **config-mobile-resilient.toml** - Optimized for mobile XMPP clients with extended grace periods
+- **config-network-switching.toml** - Advanced network resilience for WiFi ↔ LTE switching
+- **config-production-enhanced.toml** - Production-ready configuration with performance optimizations
+- **config-production-validated.toml** - Validated production configuration for enterprise deployment
+
+## Usage
+
+Copy the example that best fits your use case and customize it:
+
+```bash
+cp examples/config-production-validated.toml config.toml
+# Edit config.toml with your settings
+./hmac-file-server -config config.toml
+```
+
+## More Templates
+
+See the `templates/` directory for additional configuration templates for specific deployment methods (Docker, Podman, SystemD, Debian).