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

src/app/api/campaigns/[id]/logs/route.ts

@@ -0,0 +1,21 @@
+import { NextRequest, NextResponse } from "next/server"
+import { getSessionUser } from "@/lib/auth"
+import { query } from "@/lib/db"
+
+export async function GET(request: NextRequest, { params }: { params: Promise<{ id: string }> }) {
+  try {
+    const user = await getSessionUser()
+    if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+    const { id } = await params
+    const result = await query(
+      `SELECT l.*, s.contact_name, s.email AS subscriber_email
+       FROM email_campaign_logs l
+       LEFT JOIN email_campaign_subscribers s ON s.id = l.subscriber_id
+       WHERE l.campaign_id = $1 ORDER BY l.sent_at DESC LIMIT 100`,
+      [id]
+    )
+    return NextResponse.json(result.rows)
+  } catch (error) {
+    return NextResponse.json({ error: "Failed" }, { status: 500 })
+  }
+}