[OWL] Driver portal + Invoice PDF generation
Driver Portal:
- Refactored portal routes with shared auth + role-aware dashboard
- Driver dashboard (trips, earnings, advance, active loads)
- Driver load list (filterable, paginated)
- Driver load detail (with settlement summary: freight, commission, advance, balance)
- Shared login page detects role from credentials
Invoice PDF:
- Invoice PDF service (puppeteer-based, falls back to HTML)
- Professional invoice template (tricolor, Hindi+English, GSTIN)
- Commission calculation with TDS deduction (10%)
- GET /invoices (list, filterable by year/month)
- GET /invoices/:id (HTML preview with print button)
- GET /invoices/:id/pdf (PDF download)
- Invoices link in sidebar
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