Add external import sources, work history, screening fields and Phase 1 docs

- New ExternalImportSource and ExternalWorkHistoryEntry models, controller and migrations
- Screening fields on external profile imports
- Admin and provider profile views, routes and workflow tests updated
- Phase 1 validation, route inventory, gap report template and roadmap docs
- Add the Google Sheets work-order parser tool (tools/google-sheets-wo-parser)

docs/PHASE1_GAP_REPORT_TEMPLATE.md

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+# Phase 1 Gap Report Template
+
+Copy this template for each validation pass. Keep reports factual and tied to the current code or deployment behavior.
+
+## Validation Pass
+
+- Date:
+- Tester:
+- Environment:
+  - Local:
+  - Live:
+  - Commit:
+  - Browser/device:
+- Seed state:
+- Commands run:
+
+## Summary
+
+- Overall result:
+- Pilot blockers:
+- Usable workflows:
+- Confusing workflows:
+- Deferred observations:
+
+## Gap Entries
+
+### GAP-001 - Short Title
+
+- Role:
+- Surface:
+- URL or route:
+- Related file:
+- Workflow step:
+- Expected:
+- Actual:
+- Severity:
+  - P0 blocks validation;
+  - P1 blocks pilot;
+  - P2 causes serious friction;
+  - P3 polish or clarity issue.
+- Evidence:
+- Proposed phase:
+- Proposed fix:
+- Owner:
+- Status:
+
+### GAP-002 - Short Title
+
+- Role:
+- Surface:
+- URL or route:
+- Related file:
+- Workflow step:
+- Expected:
+- Actual:
+- Severity:
+- Evidence:
+- Proposed phase:
+- Proposed fix:
+- Owner:
+- Status:
+
+## Decision Log
+
+- Decision:
+- Reason:
+- Files or routes affected:
+- Follow-up:
+
+## Phase Impact
+
+- Phase 2 profile trust changes:
+- Phase 3 matching/search changes:
+- Phase 4 work-order/template changes:
+- Phase 5 reputation changes:
+- Phase 6 dispute/moderation changes:
+- Phase 7 notification changes:
+- Phase 8 mobile changes:
+- Phase 9 production-readiness changes:
+- Phase 10 launch-governance changes: