chore: consolidate local WIP (repo cleanup 20260707)

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/start-local-stack.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Start local dev stack: Postgres (Docker), migrate, seed, dev servers.
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+if ! docker ps --format '{{.Names}}' | grep -q '^solace-postgres$'; then
+  if docker ps -a --format '{{.Names}}' | grep -q '^solace-postgres$'; then
+    echo "Starting existing solace-postgres container..."
+    docker start solace-postgres
+  else
+    echo "Creating solace-postgres container..."
+    docker run -d --name solace-postgres \
+      -e POSTGRES_USER=solace_user \
+      -e POSTGRES_PASSWORD=SolaceTreasury2024! \
+      -e POSTGRES_DB=solace_treasury \
+      -p 5432:5432 \
+      postgres:16-alpine
+    sleep 3
+  fi
+fi
+
+echo "Running migrations and seed..."
+(cd backend && pnpm run db:migrate && pnpm run db:seed)
+
+echo "Starting dev servers (frontend :3000, backend :3001)..."
+pnpm run dev