feat: responses, AI matching, assignment rules, statements
- Schema: responses, response_chunks, request_links, assignment_rules tables
- Fireworks client: vision extraction (llama-v3p2-90b) + embeddings (nomic-embed-text-v1.5)
- PDF/XLSX extraction pipeline with pdftoppm and excelize
- Markdown chunker with heading/paragraph splitting and overlap
- Async extraction worker (2 goroutines) with cosine similarity matching at 0.72 threshold
- Response handlers: create statement, confirm/reject links, pending links, assignment rules CRUD
- Auto-assignment of requests by keyword rules on save + import
- File upload now creates response record and enqueues extraction
- Template: request status pills, assignee badges, AI match prompts, pending matches panel,
add statement modal, assignment rules panel, file extraction status with 5s poll
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