Add Turso/Vercel deployment configuration

- Updated database connection to support Turso auth token
- Added vercel.json with bun build configuration
- Updated environment schema for production deployment
- Added new features and components for production readiness

PDF_GUIDELINES.md

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+# Invoice PDF Requirements
+
+## Purpose
+Generate professional, print-ready invoice PDFs that represent the beenvoice brand and provide a good user experience.
+
+## Core Requirements
+
+### Visual Design
+- Professional appearance suitable for business use
+- Clean, modern layout that matches the app's design language
+- Consistent branding with the beenvoice logo and colors
+- Print-friendly design with good contrast and readability
+
+### Content Structure
+- Header with logo, invoice title, number, and status
+- Client information and invoice details in organized sections
+- Itemized table with all invoice line items
+- Clear total amount display
+- Professional footer with branding
+
+### Typography & Layout
+- Readable fonts that work across all systems
+- Proper hierarchy with clear headings and body text
+- Consistent spacing and alignment throughout
+- Responsive layout that works on different page sizes
+
+### Technical Requirements
+- Generate high-quality PDFs suitable for printing
+- Support multi-page documents when content is long
+- Ensure consistent rendering across different browsers
+- Fast generation without blocking the UI
+- Proper page numbering and navigation
+
+### User Experience
+- PDFs should be immediately recognizable as beenvoice invoices
+- Content should be well-organized and easy to scan
+- Professional appearance that builds trust with clients
+- Clear call-to-action and payment information
+
+### Brand Consistency
+- Use the same logo and colors as the main application
+- Maintain the same visual language and design principles
+- Ensure the PDF feels like part of the beenvoice ecosystem
+
+## Quality Standards
+- Professional enough for client-facing business use
+- Consistent with modern invoice design standards
+- Accessible and readable for all users
+- Print-ready with proper margins and formatting