fix(drift): resolve explicit network names that equal compose keys (#1588)

Compare runtimeResourceName against the project-prefixed default instead
of the compose key so networks like tailscale: { name: tailscale } are
not mis-resolved as network_tailscale in Drift, Fleet summary, and preflight.

Fixes #1581

backend/src/services/network/normalize.ts

@@ -36,8 +36,9 @@ export function isHostNetwork(mode: string | undefined): boolean {
  *  by its real name (the key, or a `name:` override), so prefixing it would invent
  *  a `<project>_<key>` that no runtime resource matches and read as foreign drift. */
 export function runtimeResourceName(projectName: string, key: string, declaredName: string | undefined, external = false): string {
-  if (declaredName && declaredName !== key) return declaredName;
-  return external ? key : `${projectName}_${key}`;
+  const defaultName = external ? key : `${projectName}_${key}`;
+  if (declaredName && declaredName !== defaultName) return declaredName;
+  return defaultName;
 }
 
 /** Extract host port numbers referenced by free-text access URLs, for the

backend/src/services/preflight/rules.ts

@@ -1,7 +1,7 @@
 import type { PreflightContext, PreflightFinding, PreflightSeverity, NodePortBinding } from './types';
 import type { EffService, EffPortSpec } from './effectiveModel';
 import type { ExposureIntent } from '../network/types';
-import { isLoopback } from '../network/normalize';
+import { isLoopback, runtimeResourceName } from '../network/normalize';
 
 /** Higher number = more severe. Used to derive a run's overall status. */
 export const SEVERITY_RANK: Record<PreflightSeverity, number> = { info: 0, warning: 1, high: 2, blocker: 3 };
@@ -52,11 +52,6 @@ function hasUidGidSignal(svc: EffService): boolean {
   return svc.user !== undefined || svc.envKeys.some(k => UID_GID_KEYS.has(k));
 }
 
-/** Resolved runtime name of a top-level network/volume (compose prefixes the project). */
-function runtimeResourceName(projectName: string, key: string, declaredName: string): string {
-  return declaredName !== key ? declaredName : `${projectName}_${key}`;
-}
-
 // ----- rules ----------------------------------------------------------------
 
 const renderFailed: PreflightRule = {