flutter 상위 구조로 포함. infra 분리 리팩토링

.env.sample

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+# ==========================================
+# Baron SSO - Unified Environment Configuration
+# ==========================================
+
+# --- General System ---
+APP_ENV=development
+TZ=Asia/Seoul
+
+# --- Infrastructure Ports ---
+DB_PORT=5432
+CLICKHOUSE_PORT_HTTP=8123
+CLICKHOUSE_PORT_NATIVE=9000
+BACKEND_PORT=3000
+FRONTEND_PORT=5000
+
+# --- Database Credentials (PostgreSQL) ---
+DB_USER=baron
+DB_PASSWORD=password
+DB_NAME=baron_sso
+
+# --- Backend Configuration ---
+# Must be 32 bytes. Generate with `openssl rand -hex 32`
+COOKIE_SECRET=super-secret-key-must-be-32-bytes!
+
+# --- Frontend Configuration ---
+# Descope Project ID (Required for Auth)
+DESCOPE_PROJECT_ID=P2t...your_descope_project_id