feat: Foundation — auth system, 9 migrations, React frontend

Backend:
- Express server with JWT httpOnly cookie auth
- POST /api/auth/register, /api/auth/login, /api/auth/logout, GET /api/auth/me
- bcrypt 12 rounds, generic 401 errors (no email/password field disclosure)
- Auth middleware protects all /api/* routes except register/login
- pg Pool database connection

Frontend (React + Vite + TailwindCSS + shadcn/ui):
- AuthContext with session restore on page load via /api/auth/me
- ProtectedRoute redirects unauthenticated users to /login
- LoginPage, RegisterPage — Hebrew RTL layout (dir=rtl), inline validation
- DashboardPage placeholder
- shadcn/ui components: Button, Input, Label, Card

Database:
- 9 migrations (001-009): extensions, users, events, vendors, guests,
  bookings, invitations, vendor_ratings, organizer_preferences
- pg_trgm for fuzzy Hebrew search, GIN indexes on style_tags
- Phase 2+3 fields included: source, payment_status, contract_value,
  vendor ratings 6-dimension, organizer preferences
- Idempotent migration runner with schema_migrations tracking table

Infrastructure:
- Dockerfile (multi-stage: build React → production node:20-alpine)
- docker-compose.yml with PostgreSQL healthcheck, expose not ports
- Migrations run automatically on container start

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

migrations/009_create_organizer_preferences.sql

@@ -0,0 +1,30 @@
+-- Migration 009: Create organizer_preferences table (Phase 3: AI recommendation engine)
+-- UP
+BEGIN;
+
+CREATE TABLE organizer_preferences (
+  id                      UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id                 UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  -- Style preferences (matches vendors.style_tags for AI matching)
+  style_tags              TEXT[],                  -- e.g. {"rustic","modern","religious"}
+  -- Typical event scale
+  typical_guest_count_min INTEGER,
+  typical_guest_count_max INTEGER,
+  -- Typical budget range in NIS
+  typical_budget_min      DECIMAL(12, 2),
+  typical_budget_max      DECIMAL(12, 2),
+  created_at              TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at              TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  -- One preference record per user
+  CONSTRAINT uq_organizer_preferences_user UNIQUE (user_id)
+);
+
+CREATE INDEX idx_organizer_prefs_user_id    ON organizer_preferences(user_id);
+CREATE INDEX idx_organizer_prefs_style_tags ON organizer_preferences USING GIN(style_tags);
+
+COMMIT;
+
+-- DOWN
+-- BEGIN;
+-- DROP TABLE IF EXISTS organizer_preferences;
+-- COMMIT;