Implement dual host configuration: bind_host and hostname

- Replace 'host' config with separate 'bind_host' and 'hostname'
- bind_host: IP/interface for server binding (default 0.0.0.0)
- hostname: Domain for URI validation (required)
- Update all parsing and validation code
- Create dist/ directory with systemd service, config, and install guide
- Add comprehensive INSTALL.md with setup instructions

dist/config.toml

@@ -0,0 +1,68 @@
+# Pollux Gemini Server Configuration
+# 
+# This is an example configuration file for the Pollux Gemini server.
+# Copy this file to /etc/pollux/config.toml and customize the values below.
+# 
+# The Gemini protocol is specified in RFC 1436: https://tools.ietf.org/rfc/rfc1436.txt
+
+# Directory containing your Gemini files (.gmi, .txt, images, etc.)
+# The server will serve files from this directory and its subdirectories.
+# Default index file is 'index.gmi' for directory requests.
+# 
+# IMPORTANT: The server needs READ access to this directory.
+# Make sure the service user (gemini) can read all files here.
+root = "/var/www/example.com"
+
+# TLS certificate and private key files
+# These files are required for TLS encryption (Gemini requires TLS).
+# 
+# For Let's Encrypt certificates (recommended for production):
+# cert = "/etc/letsencrypt/live/example.com/fullchain.pem"
+# key = "/etc/letsencrypt/live/example.com/privkey.pem"
+# 
+# To obtain Let's Encrypt certs:
+# sudo certbot certonly --standalone -d example.com
+# 
+# For development/testing, generate self-signed certs:
+# openssl req -x509 -newkey rsa:4096 -keyout /etc/pollux/key.pem -out /etc/pollux/cert.pem -days 365 -nodes -subj "/CN=example.com"
+cert = "/etc/letsencrypt/live/example.com/fullchain.pem"
+key = "/etc/letsencrypt/live/example.com/privkey.pem"
+
+# Server network configuration
+# 
+# bind_host: IP address or interface to bind the server to
+#   - "0.0.0.0" = listen on all interfaces (default)
+#   - "127.0.0.1" = localhost only
+#   - "::" = IPv6 all interfaces
+#   - Specific IP = bind to that address only
+bind_host = "0.0.0.0"
+
+# hostname: Domain name for URI validation
+#   - Used to validate incoming gemini:// URIs
+#   - Clients must use: gemini://yourdomain.com
+#   - Server validates that requests match this hostname
+hostname = "example.com"
+
+# port: TCP port to listen on
+#   - Default Gemini port is 1965
+#   - Ports below 1024 require root privileges
+#   - Choose a different port if 1965 is in use
+port = 1965
+
+# Request limiting
+# 
+# max_concurrent_requests: Maximum number of simultaneous connections
+#   - Prevents server overload and DoS attacks
+#   - Set to 0 to disable limiting (not recommended)
+#   - Typical values: 100-10000 depending on server capacity
+max_concurrent_requests = 1000
+
+# Logging configuration
+# 
+# log_level: Controls how much information is logged
+#   - "error": Only errors that prevent normal operation
+#   - "warn": Errors plus warnings about unusual conditions
+#   - "info": General operational information (recommended)
+#   - "debug": Detailed debugging information
+#   - "trace": Very verbose debugging (use only for troubleshooting)
+log_level = "info"