feat: Platform isolation, Evomi geo-targeting, proxy management

Platform isolation:
- Rename handlers to {task}-{platform}.ts convention
- Deprecate -curl variants (now _deprecated-*)
- Platform-based routing in task-worker.ts
- Add Jane platform handlers and client

Evomi geo-targeting:
- Add dynamic proxy URL builder with state/city targeting
- Session stickiness per worker per state (30 min)
- Fallback to static proxy table when API unavailable
- Add proxy tracking columns to worker_tasks

Proxy management:
- New /proxies admin page for visibility
- Track proxy_ip, proxy_geo, proxy_source per task
- Show active sessions and task history

Validation filtering:
- Filter by validated stores (platform_dispensary_id + menu_url)
- Mark incomplete stores as deprecated
- Update all dashboard/stats queries

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/migrations/107_proxy_tracking.sql

@@ -0,0 +1,23 @@
+-- Migration: 107_proxy_tracking.sql
+-- Description: Add proxy tracking columns to worker_tasks for geo-targeting visibility
+-- Created: 2025-12-13
+
+-- Add proxy tracking columns to worker_tasks
+ALTER TABLE worker_tasks
+ADD COLUMN IF NOT EXISTS proxy_ip VARCHAR(45);
+
+ALTER TABLE worker_tasks
+ADD COLUMN IF NOT EXISTS proxy_geo VARCHAR(100);
+
+ALTER TABLE worker_tasks
+ADD COLUMN IF NOT EXISTS proxy_source VARCHAR(10);
+
+-- Comments
+COMMENT ON COLUMN worker_tasks.proxy_ip IS 'IP address of proxy used for this task';
+COMMENT ON COLUMN worker_tasks.proxy_geo IS 'Geo target used (e.g., "arizona", "phoenix, arizona")';
+COMMENT ON COLUMN worker_tasks.proxy_source IS 'Source of proxy: "api" (Evomi dynamic) or "static" (fallback table)';
+
+-- Index for proxy analysis
+CREATE INDEX IF NOT EXISTS idx_worker_tasks_proxy_ip
+  ON worker_tasks(proxy_ip)
+  WHERE proxy_ip IS NOT NULL;