Switch production deployment from Docker to PM2 on Ubuntu.

Add Express gateway, ecosystem config, and one-click install with native PostgreSQL, Node, and Python venv on port 23566.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/.env.example

@@ -1,7 +1,8 @@
-DATABASE_URL=postgresql://postgres:postgres@localhost:5432/student_archive
+DATABASE_URL=postgresql://gradeapp:postgres@127.0.0.1:5432/student_archive
 SECRET_KEY=dev-secret-key-change-in-production
-CORS_ORIGINS=http://localhost:5173,http://localhost:3000
+CORS_ORIGINS=http://localhost:5173,http://localhost:23566
 UPLOAD_DIR=uploads
+API_PORT=8000
 OLLAMA_BASE_URL=http://127.0.0.1:11434
 OLLAMA_MODEL=qwen2.5:7b
 FLUCTUATION_THRESHOLD=0.08

backend/Dockerfile

@@ -1,19 +0,0 @@
-FROM python:3.11-slim
-
-WORKDIR /app
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    libgomp1 libglib2.0-0 libsm6 libxext6 libxrender-dev \
-    && rm -rf /var/lib/apt/lists/*
-
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
-
-COPY app ./app
-
-ENV UPLOAD_DIR=/app/uploads
-RUN mkdir -p /app/uploads
-
-EXPOSE 8000
-
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

backend/app/core/config.py

@@ -9,7 +9,7 @@ class Settings(BaseSettings):
     ALGORITHM: str = "HS256"
     UPLOAD_DIR: str = "uploads"
     MAX_UPLOAD_SIZE: int = 10 * 1024 * 1024
-    OLLAMA_BASE_URL: str = "http://host.docker.internal:11434"
+    OLLAMA_BASE_URL: str = "http://127.0.0.1:11434"
     OLLAMA_MODEL: str = "qwen2.5:7b"
     FLUCTUATION_THRESHOLD: float = 0.08
     CORS_ORIGINS: str = "http://localhost:5173,http://localhost:3000,http://localhost"