feat: Integrate MySQL backend and rebrand to LPD Gerana

- Add Node.js Express backend with REST API
- Create database schema and server.js
- Migrate frontend from IndexedDB to MySQL API
- Add environment configuration (.env)
- Rebrand from Koperasi to LPD Gerana
- Update all documentation and UI text
- Add configurable server port setting

Features:
- POST /api/dokumentasi - Create documentation
- GET /api/dokumentasi - Retrieve all (with search)
- GET /api/dokumentasi/:id - Get single record
- DELETE /api/dokumentasi/:id - Delete record
- Full CRUD operations with MySQL persistence

database.sql

@@ -0,0 +1,34 @@
+-- Database Schema untuk Aplikasi Dokumentasi Nasabah LPD Gerana
+
+-- Buat database jika belum ada
+CREATE DATABASE IF NOT EXISTS dokumentasi CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+USE dokumentasi;
+
+-- Tabel dokumentasi
+CREATE TABLE IF NOT EXISTS dokumentasi (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    nama VARCHAR(255) NOT NULL,
+    no_anggota VARCHAR(100) NOT NULL,
+    jenis_perjanjian VARCHAR(255) NOT NULL,
+    tanggal DATE NOT NULL,
+    catatan TEXT,
+    foto LONGTEXT NOT NULL COMMENT 'Base64 encoded image',
+    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    INDEX idx_nama (nama),
+    INDEX idx_no_anggota (no_anggota),
+    INDEX idx_tanggal (tanggal),
+    INDEX idx_timestamp (timestamp)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Tabel untuk tracking aktivitas (optional)
+CREATE TABLE IF NOT EXISTS activity_log (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    action VARCHAR(50) NOT NULL,
+    dokumentasi_id INT,
+    details TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    INDEX idx_dokumentasi_id (dokumentasi_id),
+    INDEX idx_created_at (created_at),
+    FOREIGN KEY (dokumentasi_id) REFERENCES dokumentasi(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;