Add Flask app with Tesseract OCR, dark UI, clipboard paste support

Dockerfile

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+FROM python:3.11-slim
+
+RUN apt-get update && apt-get install -y \
+    tesseract-ocr \
+    tesseract-ocr-rus \
+    tesseract-ocr-eng \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py .
+COPY templates/ ./templates/
+
+EXPOSE 8118
+
+CMD ["python", "app.py"]