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

src/request.rs

@@ -6,7 +6,7 @@ pub enum PathResolutionError {
     NotFound,
 }
 
-pub fn parse_gemini_url(request: &str, expected_host: &str, expected_port: u16) -> Result<String, ()> {
+pub fn parse_gemini_url(request: &str, hostname: &str, expected_port: u16) -> Result<String, ()> {
     if let Some(url) = request.strip_prefix("gemini://") {
         let host_port_end = url.find('/').unwrap_or(url.len());
         let host_port = &url[..host_port_end];
@@ -21,7 +21,7 @@ pub fn parse_gemini_url(request: &str, expected_host: &str, expected_port: u16)
         };
         
         // Validate host
-        if host != expected_host {
+        if host != hostname {
             return Err(());  // Hostname mismatch
         }