feat: Hermes Dashboard via m3-atlas Traefik with TLS + Netbird-only access

m3-hermes:
- Add --insecure flag (required for 0.0.0.0 bind, safe behind Netbird firewall)
- Update comments to document the Traefik proxy flow

m3-atlas Traefik:
- New service: hermes-dashboard → http://100.81.231.152:9119 (Netbird)
- New router: dash.m3ta.dev with GoDaddy TLS cert
- New middleware: netbird-only (IP whitelist 100.64.0.0/16)

Flow: Browser → dash.m3ta.dev (TLS) → Traefik → Netbird → m3-hermes:9119

hosts/m3-atlas/services/traefik.nix

@@ -43,6 +43,12 @@
     dynamicConfigOptions = {
       http = {
         services = {
+          # ── Hermes Dashboard (m3-hermes over Netbird) ────────────────
+          hermes-dashboard = {
+            loadBalancer.servers = [
+              {url = "http://100.81.231.152:9119";}
+            ];
+          };
           dummy = {
             loadBalancer.servers = [
               {url = "http://192.168.0.1";} # Diese URL wird nie verwendet
@@ -50,6 +56,12 @@
           };
         };
         middlewares = {
+          # Hermes Dashboard — Netbird mesh only
+          netbird-only = {
+            ipWhiteList = {
+              sourceRange = ["100.64.0.0/16"];
+            };
+          };
           domain-redirect = {
             redirectRegex = {
               regex = "^https://www\\.m3tam3re\\.com(.*)";
@@ -79,6 +91,16 @@
         };
 
         routers = {
+          # ── Hermes Dashboard — Netbird mesh only ─────────────────────
+          hermes-dashboard = {
+            rule = "Host(`dash.m3ta.dev`)";
+            service = "hermes-dashboard";
+            middlewares = ["netbird-only"];
+            entrypoints = ["websecure"];
+            tls = {
+              certResolver = "godaddy";
+            };
+          };
           api = {
             rule = "Host(`r.m3tam3re.com`)";
             service = "api@internal";

hosts/m3-hermes/services/hermes-dashboard.nix

@@ -4,7 +4,8 @@
   inputs,
   ...
 }: let
-  # Netbird mesh VPN range — dashboard only accessible from mesh peers
+  # Netbird mesh VPN range — dashboard only accessible from mesh peers.
+  # m3-atlas Traefik proxies to this port over Netbird.
   netbirdRange = "100.64.0.0/16";
 
   # Reference the hermes-agent package from the running service config
@@ -12,7 +13,11 @@
 in {
   # ── Hermes Dashboard systemd service ───────────────────────────────────
   # Web UI for managing Hermes Agent — sessions, config, kanban, cron, etc.
-  # Binds to 0.0.0.0:9119 but firewall restricts to Netbird mesh only.
+  #
+  # Flow: Browser → dash.m3ta.dev (TLS via m3-atlas Traefik) → Netbird → :9119
+  #
+  # --insecure is required to bind 0.0.0.0 (hermes refuses non-localhost otherwise).
+  # Safe because firewall restricts port 9119 to Netbird mesh only.
   systemd.services.hermes-dashboard = {
     description = "Hermes Agent Web Dashboard";
     after = ["network.target" "hermes-agent.service"];
@@ -24,7 +29,7 @@ in {
       User = "hermes";
       Group = "hermes";
 
-      ExecStart = "${hermesPkg}/bin/hermes dashboard --host 0.0.0.0 --port 9119 --no-open";
+      ExecStart = "${hermesPkg}/bin/hermes dashboard --host 0.0.0.0 --port 9119 --no-open --insecure";
 
       # Environment matching the hermes-agent service
       Environment = [
@@ -48,8 +53,6 @@ in {
 
   # ── Firewall: Dashboard only from Netbird mesh ─────────────────────────
   networking.firewall = {
-    # Use extraCommands for source-IP-restricted port (NixOS firewall
-    # allowedTCPPorts is all-or-nothing per port).
     extraCommands = ''
       # Allow Hermes Dashboard (9119/tcp) only from Netbird mesh VPN
       ip46tables -A nixos-fw -p tcp --dport 9119 -s ${netbirdRange} -j nixos-fw-accept