Implement Phase 2 features for Campaign Command Center

Adds 14 new features across the dashboard:
- Deal Risk Scoring (0-100) with risk factors on pipeline deals
- Account Health Score with multi-factor analysis on account cards
- Next Best Action Engine on Executive Overview
- Account Notes with pin/edit/delete in activity overlay and account detail
- Stakeholder Contact Map with role, sentiment, email, LinkedIn
- Competitive Intelligence Tracker with multi-select competitors and filtering
- CSV/Excel Export on accounts, activities, and pipeline pages
- Data Quality Dashboard in admin with completeness scoring
- Campaign Playbook Templates with 5 default plays and account progress tracking
- Goals & District Targets with quarterly tracking and progress bars
- Weekly Status Report (printable) and Executive Summary (printable)
- Activity Effectiveness Scoring showing pipeline conversion by activity type
- Mobile Activity FAB for quick activity logging on mobile
- Multi-User Auth (NextAuth + Google OAuth, @broadcom.com domain, role-based)

Also adds Phase 2 API route, scoring utilities, sidebar navigation updates,
and database schema extensions for notes, contacts, snapshots, playbooks,
and district targets.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,11 @@
+# Google Apps Script URL (provides live sheet data — no Cloud project needed)
+# See GOOGLE_SHEETS_SETUP.md for how to deploy the Apps Script
+APPS_SCRIPT_URL=https://script.google.com/macros/s/YOUR_DEPLOYMENT_ID/exec
+
+# ISR revalidation interval in seconds (default: 300 = 5 minutes)
+REVALIDATE_INTERVAL=300
+
+# Google OAuth (optional — leave unset to disable auth in dev)
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+AUTH_SECRET=   # generate with: openssl rand -base64 32