Add database migration scripts and configuration files

- Add verify-migration.js script for testing database migrations
- Add database config module for centralized configuration
- Add chutes.txt prompt for system responses
- Update database implementation and testing documentation
- Add database migration and setup scripts
- Update session system and LLM tool configuration
- Update deployment checklist and environment example
- Update Dockerfile and docker-compose configuration

Dockerfile

@@ -73,6 +73,11 @@ RUN apt-get update \
         tini \
         libicu-dev \
         libssl-dev \
+        build-essential \
+        python3 \
+        pkg-config \
+        sqlcipher \
+        libsqlcipher-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Node.js
@@ -114,6 +119,8 @@ RUN chmod +x /usr/local/bin/entrypoint.sh /usr/local/bin/healthcheck.sh /usr/loc
 
 # Copy webchat
 COPY chat /opt/webchat
+ENV npm_config_sqlite=sqlcipher \
+    npm_config_build_from_source=true
 RUN cd /opt/webchat && npm install --production && chmod -R 755 /opt/webchat
 
 COPY chat_v2 /opt/webchat_v2