fix: remove public key deployment from deploy-keys

Deploy-keys now only:
- Creates /var/lib/syncserver/ssh/keys on remote
- Uploads private keys of all other machines to that path
- Populates known_hosts with all other machine hosts

No longer touches authorized_keys or reads server public key.

web/src/api/client.ts

@@ -125,12 +125,11 @@ export interface DeployKeysResponse {
 
 export interface DeployKeysOptions {
   known_hosts_host?: string;
-  include_server_key?: boolean;
 }
 
 export async function deployKeys(machineId: number, options?: DeployKeysOptions): Promise<DeployKeysResponse> {
   return api<DeployKeysResponse>(`/api/machines/${machineId}/deploy-keys`, {
     method: 'POST',
-    body: options ?? { include_server_key: true },
+    body: options ?? {},
   });
 }

web/src/pages/Machines.tsx

@@ -217,7 +217,7 @@ export default function Machines() {
   async function handleDeployKeys(m: Machine) {
     setDeployModal({ machine: m, result: null, loading: true });
     try {
-      const result = await deployKeys(m.id, { include_server_key: true });
+      const result = await deployKeys(m.id);
       setDeployModal({ machine: m, result, loading: false });
     } catch (e: unknown) {
       setDeployModal({ machine: m, result: { success: false, messages: [], errors: [(e as Error).message] }, loading: false });