Consolidate audit-fixes branch: webhooks, integrations, and deploy hardening

Batch commit of the pending working tree on security/audit-fixes-2026-07.
Major areas:
- Outbound webhooks / Zapier: schema + signed delivery with retries, public
  v1 API (REST-hook subscribe/unsubscribe), settings UI, cron drain.
- Deploy hardening: email via SMTP2GO (Resend fully removed), verified DB TLS
  (DATABASE_SSL=require + DATABASE_CA), storage fails loud in production when
  Spaces is unconfigured instead of silently using ephemeral disk.
- Integrations & features (concurrent work): accounting (QuickBooks/Xero),
  e-signature (DocuSign/Dropbox Sign), PayPal, geocoding/maps, onboarding,
  expanded legal pages.
- DB migrations 0006–0009.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/db/migrations/0001_furry_christian_walker.sql

@@ -0,0 +1,33 @@
+-- NOTE: made idempotent (IF NOT EXISTS / guarded constraint) by hand.
+-- The admin tables/columns below were previously applied to some databases via
+-- `drizzle-kit push` without a migration file, so migration history had drifted.
+-- Guarding these statements lets 0001 provision a fresh database (creating the
+-- admin objects + app_settings) while safely no-op'ing on already-migrated DBs.
+CREATE TABLE IF NOT EXISTS "admin_audit_log" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"admin_id" text,
+	"action" text NOT NULL,
+	"target_user_id" text,
+	"metadata" jsonb DEFAULT '{}'::jsonb NOT NULL,
+	"ip_address" text,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE IF NOT EXISTS "app_settings" (
+	"key" text PRIMARY KEY NOT NULL,
+	"value" jsonb DEFAULT '{}'::jsonb NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "session" ADD COLUMN IF NOT EXISTS "impersonated_by" text;--> statement-breakpoint
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS "role" text DEFAULT 'user';--> statement-breakpoint
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS "banned" boolean DEFAULT false;--> statement-breakpoint
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS "ban_reason" text;--> statement-breakpoint
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS "ban_expires" timestamp;--> statement-breakpoint
+DO $$ BEGIN
+	IF NOT EXISTS (
+		SELECT 1 FROM pg_constraint WHERE conname = 'admin_audit_log_admin_id_user_id_fk'
+	) THEN
+		ALTER TABLE "admin_audit_log" ADD CONSTRAINT "admin_audit_log_admin_id_user_id_fk" FOREIGN KEY ("admin_id") REFERENCES "public"."user"("id") ON DELETE set null ON UPDATE no action;
+	END IF;
+END $$;