Port diligence request model + CSV/XLSX import from old dealroom
- Add RequestData and WorkstreamData types to lib/types.go
- Add excelize/v2 dependency for XLSX parsing
- Add GET /api/projects/{projectID}/requests endpoint (lists requests grouped by section)
- Add POST /api/projects/{projectID}/requests/import endpoint with:
- Smart header detection (scans first 12 rows for keyword matches)
- CSV and XLSX support (detects by extension + magic bytes)
- Priority mapping (high/critical/urgent→high, low/nice/optional→low)
- Mode: add or replace existing requests
- Optional section_filter parameter
- Optional create_workstreams=true to create workstreams from sections
- Update project.html template:
- Requests tab calls /api/projects/{id}/requests
- Results grouped by section with collapsible headers
- Shows item_number, title, priority badge (colored dot), status badge
- Import button opens modal with file upload, mode selector, options
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