feat: add full org page capabilities to account detail page

[bokelley]

Summary

• Port all missing features from admin-org-detail.html to admin-account-detail.html to fully replace the org page with the accounts page
• Enable name editing in Edit Account modal (was previously disabled)
• Add Payment Link modal with product selection and discount support
• Add Invoice modal with product selection and billing address form
• Add Revenue Tier and Parent Organization selectors to Edit Account modal
• Add Addie Research section (loaded asynchronously)
• Add Member Insights section (loaded asynchronously)
• Add domain actions: verify, set primary, remove

Security improvements:

• Use event delegation with data attributes instead of inline onclick handlers to prevent XSS vulnerabilities
• Add 401 authentication handling to domain action functions
• Escape user-provided values in confirmation dialogs

Test plan

• Verify name can be edited and saved in Edit Account modal
• Test Payment Link modal: opens, loads products, generates link
• Test Invoice modal: opens, loads products, submits with billing info
• Test Revenue Tier selector saves correctly
• Test Parent Organization selector saves correctly
• Test Addie Research section loads for accounts with research
• Test Member Insights section loads correctly
• Test domain verify action
• Test domain set primary action
• Test domain remove action
• Verify 401 responses redirect to login

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