feat: native app links for passkeys (#12580)

# Which Problems Are Solved

- Native iOS/Android passkeys need OS trust files on the ZITADEL domain;
without them, Associated Domains / App Links verification fails.
- Operators could not configure iOS Team ID + Bundle ID or Android
package name + SHA-256 fingerprints on OIDC apps.
- `/.well-known/apple-app-site-association` and
`/.well-known/assetlinks.json` were not served from application config.

# How the Problems Are Solved

- Add iOS/Android app-link fields on OIDC app create/update (Application
API v2 + Management), with validation.
- Persist and project those fields; query active app-link configs
instance-wide.
- Serve AASA (`webcredentials`) and Digital Asset Links
(`get_login_creds`) from well-known paths, with configurable
`Cache-Control` and fingerprint normalization at serve time.
- Console UI to edit the fields, with links to the well-known endpoints.
- Operator docs for configuration, endpoints, caching, and verification.

# Additional Changes

- Document on API fields that well-known responses may be HTTP-cached
and platform verifiers may delay propagation.
- Runtime config: `WellKnown.AppLinksCacheControlMaxAge` (default `5m`;
`0` → `no-store`).

# Additional Context

- Closes #12497
- Implemented and reviewed as stack:
  - #12531 API contract
  - #12532 storage wiring
  - #12536 well-known endpoints
  - #12537 console
  - #12547 docs

---------

Co-authored-by: Cursor <[email protected]>

apps/docs/content/guides/manage/console/applications-overview.mdx

@@ -63,6 +63,15 @@ Native Applications are installed on a thin client, such as a smartphone or desk
 
 <AuthType components={props.components} appType="native" />
 
+#### Native app links
+
+For native passkeys, configure OS association on the OIDC app under **Native App Links**:
+
+* **iOS:** Team ID and Bundle ID (published in `/.well-known/apple-app-site-association`)
+* **Android:** Package name and SHA-256 certificate fingerprints (published in `/.well-known/assetlinks.json`)
+
+See [Native app links for passkeys](/guides/integrate/login/oidc/native-app-links) for endpoint details, caching, and verification.
+
 ### User Agent
 
 User Agent Applications are executed entirely in the web browser (Client-Side).
@@ -219,3 +228,4 @@ Ensure the management of application settings is limited to authorized users onl
 ## References
 
 - [Recommended OIDC Flows](../../integrate/login/oidc/oauth-recommended-flows)
+- [Native app links for passkeys](../../integrate/login/oidc/native-app-links)