feat: AI 미디어 허브 초기 세팅 및 Gemini 2.5 Flash 썸네일 비전 분석 적용

Dockerfile

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+# Stage 1: Build the Go Application
+FROM golang:1.22-alpine AS builder
+WORKDIR /app
+# Initialize go mod if not exists, download deps
+COPY . .
+RUN go mod init ai-media-hub || true
+RUN go mod tidy
+RUN CGO_ENABLED=0 GOOS=linux go build -o ai-media-hub main.go
+
+# Stage 2: Final Image (Python 3.10+ & yt-dlp & Go Binary)
+FROM python:3.10-slim
+WORKDIR /app
+
+# Install dependencies (ffmpeg for media merging/cropping)
+RUN apt-get update && \
+    apt-get install -y ffmpeg curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install yt-dlp
+RUN pip install --no-cache-dir yt-dlp
+
+# Copy Go binary and frontend files from builder
+COPY --from=builder /app/ai-media-hub /app/ai-media-hub
+COPY --from=builder /app/index.html /app/index.html
+
+# Expose port
+EXPOSE 8000
+
+# Directory for NAS mount
+RUN mkdir -p /data/nas
+
+# Run the Go server
+CMD ["./ai-media-hub"]