add local service proxy with .numa domains

HTTP reverse proxy on port 80 lets developers use clean domain names
(frontend.numa, api.numa) instead of localhost:PORT. Includes WebSocket
upgrade support for HMR, TCP health checks, dashboard UI panel, and
REST API for service management. numa.numa is preconfigured for the
dashboard itself.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/service_store.rs

@@ -0,0 +1,52 @@
+use std::collections::HashMap;
+
+use serde::Serialize;
+
+#[derive(Clone, Serialize)]
+pub struct ServiceEntry {
+    pub name: String,
+    pub target_port: u16,
+}
+
+pub struct ServiceStore {
+    entries: HashMap<String, ServiceEntry>,
+}
+
+impl Default for ServiceStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl ServiceStore {
+    pub fn new() -> Self {
+        ServiceStore {
+            entries: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, name: &str, target_port: u16) {
+        let key = name.to_lowercase();
+        self.entries.insert(
+            key.clone(),
+            ServiceEntry {
+                name: key,
+                target_port,
+            },
+        );
+    }
+
+    pub fn lookup(&self, name: &str) -> Option<&ServiceEntry> {
+        self.entries.get(&name.to_lowercase())
+    }
+
+    pub fn remove(&mut self, name: &str) -> bool {
+        self.entries.remove(&name.to_lowercase()).is_some()
+    }
+
+    pub fn list(&self) -> Vec<&ServiceEntry> {
+        let mut entries: Vec<_> = self.entries.values().collect();
+        entries.sort_by(|a, b| a.name.cmp(&b.name));
+        entries
+    }
+}