fix: Update element chat config and defaults

- Update element chat default name to 'elementchat'
- Sanitize element chat name from invalid characters
- Set default namespace based on sanitized name
- Validate namespace for invalid characters
- Update documentation with new default values

lib/installers/k8s/element_chat/README.md

@@ -5,6 +5,7 @@ A Kubernetes installer for Element Chat (Matrix Conduit + Element Web) with TFGr
 ## Overview
 
 This installer deploys a complete Matrix chat solution consisting of:
+
 - **Conduit**: A lightweight Matrix homeserver implementation
 - **Element Web**: A modern web client for Matrix
 - **TFGW (ThreeFold Gateway)**: Provides public FQDNs with TLS termination
@@ -30,9 +31,9 @@ All configuration options are optional and have sensible defaults:
 ### Hostnames and Namespace
 
 ```v
-installer.matrix_hostname = 'matrixchat'    // Default: 'matrixchat'
-installer.element_hostname = 'elementchat'  // Default: 'elementchat'
-installer.namespace = 'chat'                // Default: 'chat'
+installer.matrix_hostname = 'matrixchat'    // Default: '${installer.name}matrix'
+installer.element_hostname = 'elementchat'  // Default: '${installer.name}element'
+installer.namespace = 'chat-namespace'                // Default: '${installer.name}-element-chat-namespace'
 ```
 
 **Note**: Use only alphanumeric characters in hostnames (no underscores or dashes).

lib/installers/k8s/element_chat/element_chat_model.v

@@ -30,7 +30,7 @@ pub mut:
 @[heap]
 pub struct ElementChat {
 pub mut:
-	name             string = 'element_chat'
+	name             string = 'elementchat'
 	matrix_hostname  string
 	element_hostname string
 	namespace        string
@@ -55,8 +55,22 @@ pub mut:
 fn obj_init(mycfg_ ElementChat) !ElementChat {
 	mut mycfg := mycfg_
 
+	if mycfg.name == '' {
+		mycfg.name = 'elementchat'
+	}
+
+	// Replace the dashes, dots, and underscores with nothing
+	mycfg.name = mycfg.name.replace('_', '')
+	mycfg.name = mycfg.name.replace('-', '')
+	mycfg.name = mycfg.name.replace('.', '')
+
 	if mycfg.namespace == '' {
-		mycfg.namespace = 'chat'
+		mycfg.namespace = '${mycfg.name}-element-chat-namespace'
+	}
+
+	if mycfg.namespace.contains('_') || mycfg.namespace.contains('.') {
+		console.print_stderr('namespace cannot contain _, was: ${mycfg.namespace}, use dashes instead.')
+		return error('namespace cannot contain _, was: ${mycfg.namespace}')
 	}
 
 	if mycfg.matrix_hostname == '' {