feat: AI 미디어 허브 초기 세팅 및 뼈대 코드 완성

Dockerfile

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+# Stage 1: Build the Go application
+FROM golang:1.21-alpine AS builder
+
+WORKDIR /app
+# Mock basic go mod init so it can build without external pre-requisites
+RUN go mod init ai-media-hub && \
+    go get github.com/gofiber/fiber/v2 github.com/gofiber/fiber/v2/middleware/cors github.com/gofiber/fiber/v2/middleware/logger github.com/gofiber/websocket/v2
+COPY backend/ ./backend/
+RUN CGO_ENABLED=0 GOOS=linux go build -o /ai-media-hub ./backend/main.go
+
+# Stage 2: Final runtime container with Python & Go binary
+FROM python:3.10-slim
+
+WORKDIR /app
+
+# Install dependencies (ffmpeg for yt-dlp processing)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ffmpeg curl ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Python worker requirements
+COPY worker/requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy Go binary from builder
+COPY --from=builder /ai-media-hub /app/ai-media-hub
+
+# Copy Frontend files and worker files
+COPY frontend/ ./frontend/
+COPY worker/ ./worker/
+
+# Expose port (Internal 8000)
+EXPOSE 8000
+
+# Entrypoint: Run Go backend
+CMD ["/app/ai-media-hub"]