Add build export compliance management

[trmquang93]

Summary

• Add ability to view and manage export compliance (encryption declarations) for builds directly from the dashboard
• Builds list now shows compliance state (Missing Compliance badge) fetched via ASC API include=appEncryptionDeclaration
• New two-step compliance modal matching App Store Connect UX: encryption yes/no, then algorithm type selection
• Backend routes for fetching and updating encryption declarations via ASC API v2

Changes

Backend (server/routes/apps.js):

• Updated GET /:appId/builds to include appEncryptionDeclaration relationship data
• Added GET /:appId/builds/:buildId/encryptionDeclaration route
• Added PATCH /:appId/builds/:buildId/encryptionDeclaration route

Frontend:

• New BuildComplianceModal.jsx component with two-step encryption declaration flow
• BuildSelector.jsx -- orange "Missing Compliance" warning + "Manage" link on attached build
• BuildSelectorModal.jsx -- compliance badge pills on build rows
• VersionDetailPage.jsx -- wires compliance modal state and refresh

Test plan

• Navigate to an app version with a build showing "Missing Compliance"
• Verify the orange badge and "Manage" link appear on the selected build
• Click "Manage" and verify the modal opens with encryption question
• Test "No" flow -- should save immediately and clear the missing compliance state
• Test "Yes" flow -- should show algorithm type selection, then save
• Verify compliance badges also appear in the build selector modal
• Verify builds list refreshes after successful declaration