Refactor: Move backend files to backend/ directory and split .gitignore

backend/.env.example

@@ -0,0 +1,56 @@
+# API Keys
+OPENAI_API_KEY=your_openai_api_key_here
+GOOGLE_API_KEY=your_google_api_key_here
+
+# App Configuration
+DATA_DIR=data
+DATA_STATE=new_jersey
+LOG_LEVEL=INFO
+DEV_MODE=false
+
+# Security & JWT Configuration
+SECRET_KEY=change-me-in-production
+ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+
+# Voter Database Configuration
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=blockdata
+DB_USER=user
+DB_PSWD=password
+DB_TABLE=rd_gc_voters_nj
+
+# Application/History Database Configuration
+HISTORY_DB_URL=postgresql://user:password@localhost:5433/ea_history
+
+# OIDC Configuration (Authentik/SSO)
+OIDC_CLIENT_ID=your_client_id
+OIDC_CLIENT_SECRET=your_client_secret
+OIDC_SERVER_METADATA_URL=https://your-authentik.example.com/application/o/ea-chatbot/.well-known/openid-configuration
+OIDC_REDIRECT_URI=http://localhost:8501
+
+# Node Configuration Overrides (Optional)
+# Format: <NODE_NAME>_LLM__<PARAMETER>
+# Possible parameters: PROVIDER, MODEL, TEMPERATURE, MAX_TOKENS
+
+# Query Analyzer
+# QUERY_ANALYZER_LLM__PROVIDER=openai
+# QUERY_ANALYZER_LLM__MODEL=gpt-5-mini
+# QUERY_ANALYZER_LLM__TEMPERATURE=0.0
+
+# Planner
+# PLANNER_LLM__PROVIDER=openai
+# PLANNER_LLM__MODEL=gpt-5-mini
+
+# Coder
+# CODER_LLM__PROVIDER=openai
+# CODER_LLM__MODEL=gpt-5-mini
+
+# Summarizer
+# SUMMARIZER_LLM__PROVIDER=openai
+# SUMMARIZER_LLM__MODEL=gpt-5-mini
+
+# Researcher
+# RESEARCHER_LLM__PROVIDER=google
+# RESEARCHER_LLM__MODEL=gemini-2.0-flash