docs: Update CLAUDE.md - use remote PostgreSQL via SSH port forwarding (178.104.200.7)

CLAUDE.md

@@ -13,19 +13,33 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ### Prerequisites
 - .NET 10 SDK
 - Node.js 22 / pnpm 10
-- PostgreSQL 17 (installed locally)
+- SSH access to remote PostgreSQL server (178.104.200.7)
 
-### Local PostgreSQL Setup
+### Remote PostgreSQL Setup via SSH Port Forwarding
 
-Ensure PostgreSQL 17 is running locally on default port 5432. Create the database and user:
+The project database is hosted on `178.104.200.7`. Connect via SSH port forwarding:
 
-```sql
-CREATE DATABASE kartsell;
-CREATE USER kartsell WITH PASSWORD 'kartsell';
-ALTER ROLE kartsell CREATEDB;
-GRANT ALL PRIVILEGES ON DATABASE kartsell TO kartsell;
+```bash
+ssh -L 5432:127.0.0.1:5432 kjh2064@178.104.200.7
 ```
 
+This command:
+- Forwards local port 5432 to remote PostgreSQL (127.0.0.1:5432)
+- Keeps the tunnel open while you develop
+- Run in a separate terminal/window and keep it running during development
+
+**Windows (PowerShell):**
+```powershell
+ssh -L 5432:127.0.0.1:5432 kjh2064@178.104.200.7
+```
+
+**macOS/Linux:**
+```bash
+ssh -L 5432:127.0.0.1:5432 kjh2064@178.104.200.7
+```
+
+Once the tunnel is open, your local `localhost:5432` connects to the remote database.
+
 ### Local Development Environment
 
 ```bash