fix(networking): treat host-network services as host-exposed in summaries (#1430)

The exposure summaries derived a stack's exposure solely from the declared
published-port list, so a service running with network_mode: host (which
publishes every container port on the host but declares no ports:) was
under-reported as less exposed than it actually is.

Capture network_mode in the lightweight dependency parser, add an
isHostNetwork predicate, and treat a host-network service as exposed and
publishing across the Fleet networking summary, the Stack Dossier export, and
the Networking panel, matching how the Compose Doctor already flags host
networking.

frontend/src/lib/dossierMarkdown.test.ts

@@ -30,7 +30,7 @@ describe('buildStackDossierMarkdown', () => {
     const md = buildStackDossierMarkdown(anatomy, fields(), {
       stackIntent: 'internal',
       networks: [{ name: 'plex_default', external: false, internal: false }],
-      services: [{ name: 'plex', intent: null, ports: ['32400/tcp (all interfaces)'] }],
+      services: [{ name: 'plex', intent: null, ports: ['32400/tcp (all interfaces)'], hostNetwork: false }],
     });
     expect(md).toContain('## Network exposure');
     expect(md).toContain('**Stack intent:** internal');

frontend/src/lib/networkExposureSummary.test.ts

@@ -31,7 +31,15 @@ describe('buildNetworkExposureSummary', () => {
     expect(s).toEqual({
       stackIntent: 'internal',
       networks: [{ name: 'app_backend', external: false, internal: true }],
-      services: [{ name: 'web', intent: 'public', ports: ['8080/tcp (all interfaces)', '9000/tcp (loopback)'] }],
+      services: [{ name: 'web', intent: 'public', ports: ['8080/tcp (all interfaces)', '9000/tcp (loopback)'], hostNetwork: false }],
+    });
+  });
+  it('flags a host-network service as host-exposed even with no published ports', () => {
+    const s = buildNetworkExposureSummary({ renderable: true, networks: [], services: [{ name: 'app', publishedPorts: [], networkMode: 'host' }] }, []);
+    expect(s).toEqual({
+      stackIntent: null,
+      networks: [],
+      services: [{ name: 'app', intent: null, ports: [], hostNetwork: true }],
     });
   });
 });
@@ -47,6 +55,10 @@ describe('networkExposureSection', () => {
   it('returns null for a null summary', () => {
     expect(networkExposureSection(null)).toBeNull();
   });
+  it('renders the host-network phrase for a host-mode service', () => {
+    const md = networkExposureSection(buildNetworkExposureSummary({ renderable: true, networks: [], services: [{ name: 'app', publishedPorts: [], networkMode: 'host' }] }, [])) ?? '';
+    expect(md).toContain('host network (all ports exposed on host)');
+  });
   it('never includes a value that lives in an ignored field (no env or label leak)', () => {
     // A secret planted in fields the builder does not read must not surface.
     const leaky = facts({

frontend/src/lib/networkExposureSummary.ts

@@ -9,13 +9,13 @@
 export interface NetworkExposureSummary {
   stackIntent: string | null;
   networks: { name: string; external: boolean; internal: boolean }[];
-  services: { name: string; intent: string | null; ports: string[] }[];
+  services: { name: string; intent: string | null; ports: string[]; hostNetwork: boolean }[];
 }
 
 // Loose input shapes: the builder reads the raw parsed /networking and
 // /exposure JSON, so it stays decoupled from the panel's local interfaces.
 interface FactsPort { startPort: number; endPort: number; protocol: string; allInterfaces: boolean; loopbackOnly: boolean }
-interface FactsService { name: string; publishedPorts?: FactsPort[] }
+interface FactsService { name: string; publishedPorts?: FactsPort[]; networkMode?: string }
 interface FactsNetwork { name: string; external: boolean; internal: boolean }
 export interface NetworkFactsInput { renderable?: boolean; networks?: FactsNetwork[]; services?: FactsService[] }
 export interface ExposureIntentInput { service: string; intent: string }
@@ -36,9 +36,12 @@ export function buildNetworkExposureSummary(facts: NetworkFactsInput | null, int
     name: s.name,
     intent: byService.get(s.name) ?? null,
     ports: (s.publishedPorts ?? []).map(portLabel),
+    // network_mode: host publishes every container port on the host, so it is
+    // exposure-relevant even with no declared ports.
+    hostNetwork: s.networkMode === 'host',
   }));
   const empty = networks.length === 0 && stackIntent === null
-    && services.every(s => s.ports.length === 0 && s.intent === null);
+    && services.every(s => s.ports.length === 0 && s.intent === null && !s.hostNetwork);
   return empty ? null : { stackIntent, networks, services };
 }
 
@@ -53,11 +56,12 @@ export function networkExposureSection(summary: NetworkExposureSummary | null):
       return `- ${n.name}${flags ? ` (${flags})` : ''}`;
     }).join('\n'));
   }
-  const services = summary.services.filter(s => s.ports.length > 0 || s.intent);
+  const services = summary.services.filter(s => s.ports.length > 0 || s.intent || s.hostNetwork);
   if (services.length > 0) {
     parts.push('### Services', services.map(s => {
       const bits: string[] = [];
       if (s.intent) bits.push(`intent ${s.intent}`);
+      if (s.hostNetwork) bits.push('host network (all ports exposed on host)');
       if (s.ports.length > 0) bits.push(`ports ${s.ports.join(', ')}`);
       return `- **${s.name}:** ${bits.join('; ')}`;
     }).join('\n'));