Implement unified Oracle mode support with auto-detection

- Unified Dockerfile with thick/thin mode auto-detection
- Single docker-compose.yaml with build arguments
- Auto-detect logic: thick mode for Oracle 10g/11g, thin mode for 12.1+
- Simplified .env configuration with clear mode selection
- Updated admin.py with FORCE_THIN_MODE and INSTANTCLIENTPATH support
- Added comprehensive documentation for both deployment modes
- Container tested successfully with thick mode for Oracle 11g compatibility

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker-compose.yaml

@@ -1,27 +1,30 @@
-version: '3.8'
+# UNIFIED Docker Compose - AUTO-DETECT Oracle Mode
+# 
+# Configurare prin .env:
+# - Oracle 10g/11g: setează INSTANTCLIENTPATH=/opt/oracle/instantclient_23_9
+# - Oracle 12.1+:   setează FORCE_THIN_MODE=true (sau elimină INSTANTCLIENTPATH)
+#
+# Build modes:
+# - docker-compose up --build                    → thick mode (default)  
+# - docker-compose up --build --build-arg ORACLE_MODE=thin → thin mode
 
 services:
-  # Main Flask Application for Web Admin Interface
   gomag_admin:
     build:
       context: ./api
       dockerfile: Dockerfile
+      args:
+        # thick = Oracle 10g/11g/12.1+ (cu Instant Client)
+        # thin  = Oracle 12.1+ only (fără Instant Client)
+        ORACLE_MODE: ${ORACLE_MODE:-thick}
     container_name: gomag-admin
     ports:
-      - "5003:5000"  # Unique port for this project
+      - "5003:5000"
     volumes:
       - ./api:/app
-      - ./logs:/app/logs  # Shared logging directory
-    environment:
-      - PYTHONUNBUFFERED=1
-      - FLASK_ENV=development
-      - FLASK_DEBUG=1
-      # Oracle connection settings - same as ROA server
-      - ORACLE_USER=CONTAFIN_ORACLE
-      - ORACLE_PASSWORD=ROMFASTSOFT
-      - ORACLE_DSN=ROA_ROMFAST
-      - TNS_ADMIN=/app
-      - INSTANTCLIENTPATH=/opt/oracle/instantclient_21_1
+      - ./logs:/app/logs
+    env_file:
+      - ./api/.env
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:5000/health"]
@@ -29,12 +32,6 @@ services:
       timeout: 10s
       retries: 3
 
-# Shared network for inter-container communication
 networks:
   default:
-    driver: bridge
-
-# Persistent volumes
-volumes:
-  logs_data:
-    driver: local
+    driver: bridge