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feat: expand Caddy.Config.Global with 35+ typed fields and nested structs

- Add 35+ new typed fields for comprehensive global options (ports, TLS, logging, servers, PKI)
- Implement 4 nested config structs (Timeouts, Log, Server, PKI) with Caddyfile protocol
- Support servers configuration with per-listener options and timeouts
- Support logging configuration with named loggers and filtering
- Support PKI configuration for internal certificate authorities
- Maintain full backward compatibility with existing code (SC-003)
- Add telemetry events for config rendering (FR-040)
- Implement comprehensive test suite with 239 tests covering all scenarios
- All code passes strict linting (credo), type checking (dialyzer), and formatting