Restore .env.example as requested

Author: jigarbhoye04

backend/.env.example

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+# ============================================================================================
+# IMPORTANT: DO NOT DELETE THIS FILE
+# --------------------------------------------------------------------------------------------
+# This `.env.example` file is required for the repository. It serves as a reference template
+# showing the environment variables needed to run the project. Actual values must be provided
+# via Infisical or your own `.env` file, but this file should remain in version control.
+#
+# For setup instructions and details on configuring environment variables, see:
+# https://docs.heygaia.io/configuration/environment-variables
+# ============================================================================================
+
+# Environment Configuration
+ENV=development                      # Environment type: development, staging, production
+DISABLE_PROFILING=true               # Disable performance profiling in non-production environments
+
+# Infisical Secrets Management
+# Required for fetching secrets and API keys from Infisical
+INFISICAL_PROJECT_ID=                # Project ID from Infisical dashboard
+INFISICAL_MACHINE_INDENTITY_CLIENT_ID=      # Machine identity client ID for authentication
+INFISICAL_MACHINE_INDENTITY_CLIENT_SECRET=  # Machine identity client secret for authentication
+
+# Optional: LangSmith for tracing (can also be stored in Infisical)
+LANGSMITH_TRACING=false              # Enable LangSmith tracing
+LANGSMITH_API_KEY=                   # LangSmith API key
+
+# Note: All other API keys should be stored in Infisical, not in this .env file
+# This includes: OPENAI_API_KEY, GEMINI_API_KEY, etc.

frontend/.env.example

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+# GAIA Frontend Environment Variables
+#
+# NOTE: These are local environment variables for the frontend. While Infisical
+# can be used for frontend secrets, most frontend environment variables are
+# typically configured locally since they're needed during build time.
+#
+# Read more about environment variables: https://docs.heygaia.io/self-hosting/environment-variables
+# Learn about Infisical setup: https://docs.heygaia.io/self-hosting/infisical-setup
+
+NEXT_PUBLIC_API_BASE_URL=http://localhost:8000/api/v1/
+
+# Blog management bearer token (for creating/editing/deleting blog posts)
+NEXT_PUBLIC_BLOG_BEARER_TOKEN=your-blog-token-here