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)

docker-compose.override.yml

@@ -0,0 +1,31 @@
+# Local development override - mounts source code for hot reload
+x-engine-image: &engine-image
+  image: tf-engine:local
+
+x-ui-image: &ui-image
+  image: tf-ui:local
+
+services:
+  engine:
+    <<: *engine-image
+    volumes:
+      - /Users/bnair/Documents/Crypto/engine:/data/engine
+      - /Users/bnair/Documents/Crypto/shared:/data/shared
+      - /Users/bnair/Documents/TradeFinder/src:/app/src:ro
+    user: root
+
+  ui:
+    <<: *ui-image
+    volumes:
+      - /Users/bnair/Documents/Crypto/engine:/data/engine  # DuckDB needs write access for WAL
+      - /Users/bnair/Documents/Crypto/shared:/data/shared
+      - /Users/bnair/Documents/TradeFinder/src:/app/src:ro
+    user: root
+
+  optimizer:
+    <<: *engine-image
+    user: root
+
+  backtester:
+    <<: *engine-image
+    user: root