fix(6): make Caddy listen on any IP/hostname for HTTPS

Changed from localhost-specific to wildcard listening:
  - https://:8918 (any IP on port 8918) → backend
  - https://:8919 (any IP on port 8919) → frontend

On-demand TLS generates certificates for any accessing IP/hostname
Self-signed certs now work via:
  - localhost
  - 127.0.0.1
  - 192.168.x.x (or any IP on network)
  - Any hostname

Tested and verified working via 192.168.84.131:8919

Caddyfile.standalone

@@ -1,5 +1,5 @@
 # TFM aInventory - Standalone Caddy Configuration
-# Self-signed SSL/TLS reverse proxy for localhost deployment
+# Self-signed SSL/TLS reverse proxy for any IP/hostname
 {
     admin off
     local_certs
@@ -11,8 +11,8 @@
 }
 
 # Dynamic HTTPS Frontend (port 8919) - Matches ANY IP or hostname
-https://localhost:8919 {
-    tls internal {
+https://:8919 {
+    tls internal {
         on_demand
     }
     reverse_proxy localhost:8917
@@ -27,8 +27,8 @@ https://localhost:8919 {
 }
 
 # Dynamic HTTPS Backend (port 8918) - Matches ANY IP or hostname
-https://localhost:8918 {
-    tls internal {
+https://:8918 {
+    tls internal {
         on_demand
     }
     reverse_proxy localhost:8916