Fix engine daemon exit and UI DuckDB access

- Add if __name__ == '__main__' guard to main.py (engine exited immediately)
- Update Dockerfile TA-Lib build for ARM64 (config.guess/config.sub)
- Add redis dependency to pyproject.toml
- Add docker-compose.override.yml for local dev with source mounting
- Remove :ro from UI engine volume mount (DuckDB needs write for WAL)

Dockerfile

@@ -11,12 +11,15 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
     wget \
     curl \
+    dpkg-dev \
     && rm -rf /var/lib/apt/lists/*
 
-# Install TA-Lib C library
+# Install TA-Lib C library (with ARM64 support)
 RUN wget -q http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz \
     && tar -xzf ta-lib-0.4.0-src.tar.gz \
     && cd ta-lib \
+    && wget -q -O config.guess 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD' \
+    && wget -q -O config.sub 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD' \
     && ./configure --prefix=/usr \
     && make \
     && make install \