Add Lead Scoring ML + Email Sequences/Drip Campaigns

Lead Scoring:
- lead_scoring_config table with configurable feature weights
- Scoring engine: boolean, keyword, and range-based feature scoring
- Settings tab: configure scoring features, run scoring on all leads
- ml_score + ml_score_details columns on leads table
- API: /api/leads/score, /api/leads/score/config
- mlScore returned in lead detail and list APIs

Email Campaigns:
- email_campaigns, email_campaign_steps, subscribers, logs tables
- Campaign list page with status badges and subscriber counts
- Campaign detail with step management, subscriber search/add, send
- Drip logic: steps with configurable delay days, template variables
- Variable replacement ({{name}}, {{email}}) in email bodies
- Sidebar: Campaigns nav item

database/migrations/run_all.sql

@@ -91,5 +91,11 @@ BEGIN;
 \echo '=== Running 024_resource_planning.sql (Resource Planning) ==='
 \i 024_resource_planning.sql
 
+\echo '=== Running 025_lead_scoring.sql (Lead Scoring ML) ==='
+\i 025_lead_scoring.sql
+
+\echo '=== Running 026_email_campaigns.sql (Email Campaigns) ==='
+\i 026_email_campaigns.sql
+
 \echo '=== Migration Complete ==='
 COMMIT;