Add LDAP authentication and camera access controls

[nutzlastfan]

Summary

• Adds optional LDAP authentication with settings UI and a test endpoint.
• Adds camera access configuration using camera groups and LDAP group rules.
• Supports default deny behavior and Active Directory bind/name fallback cases.

Why

Deployments that already manage users and groups in LDAP/AD can use those groups for Viseron login and camera-level access without hardcoding deployment-specific values in code.

Validation

• Cherry-picked onto current upstream dev.
• Ran git diff --check for this branch.

Note

The follow-up integration that edits direct camera access from the camera edit dialog depends on both this PR and the camera configuration UI PR, so it is intentionally not included here.

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[nutzlastfan]