feat(networks): add name field to networks

- Migration 0007: ALTER TABLE networks ADD COLUMN name TEXT NOT NULL DEFAULT ''
- Network model, repository, and API updated to include name
- Networks page: name input in the add form, Name column as first column in table
- Delete modal now shows "Name (CIDR)" for clarity
- Hosts page: network dropdowns now show network name instead of CIDR
- Seeds updated with names (LAN, DMZ, Corporate, VPN)

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

src/server/repository/networks.rs

@@ -11,7 +11,7 @@ use crate::server::db::DbError;
 pub async fn list_networks(pool: &AnyPool) -> Result<Vec<Network>, DbError> {
     // `fetch_all` runs the query and collects every row into a Vec.
     // It returns an error if the query fails; an empty table returns Ok(vec![]).
-    let rows = sqlx::query("SELECT id, cidr FROM networks ORDER BY id")
+    let rows = sqlx::query("SELECT id, name, cidr FROM networks ORDER BY id")
         .fetch_all(pool)
         .await?;
 
@@ -42,11 +42,14 @@ pub async fn find_network(pool: &AnyPool, id: i64) -> Result<Option<Network>, Db
 /// `RETURNING id, cidr` reads back the inserted row in a single round-trip,
 /// avoiding a separate SELECT after the INSERT.
 /// Requires SQLite ≥ 3.35 (2021) and any PostgreSQL version.
-pub async fn create_network(pool: &AnyPool, cidr: &str) -> Result<Network, DbError> {
-    let row = sqlx::query("INSERT INTO networks (cidr) VALUES ($1) RETURNING id, cidr")
-        .bind(cidr)
-        .fetch_one(pool) // exactly one row is returned by RETURNING
-        .await?;
+pub async fn create_network(pool: &AnyPool, name: &str, cidr: &str) -> Result<Network, DbError> {
+    let row = sqlx::query(
+        "INSERT INTO networks (name, cidr) VALUES ($1, $2) RETURNING id, name, cidr",
+    )
+    .bind(name)
+    .bind(cidr)
+    .fetch_one(pool)
+    .await?;
 
     Ok(row_to_network(&row))
 }
@@ -73,7 +76,8 @@ pub async fn delete_network(pool: &AnyPool, id: i64) -> Result<bool, DbError> {
 /// The type must implement `sqlx::Decode` for the `Any` backend.
 fn row_to_network(row: &sqlx::any::AnyRow) -> Network {
     Network {
-        id: row.get("id"),
+        id:   row.get("id"),
+        name: row.get("name"),
         cidr: row.get("cidr"),
     }
 }