Add .env.template for easier development setup

[abhinab-choudhury]

Problem

Currently, the repository does not provide a .env.template (or .env.example) file.
New contributors and developers may not know which environment variables are required to run the project locally.

This can make the setup process confusing and slow down onboarding.

Proposed Solution

Add a .env.template file that lists all required environment variables with empty values and helpful comments.

Example:

# App mode
MODE=development

# PostHog analytics
VITE_PUBLIC_POSTHOG_HOST=
VITE_PUBLIC_POSTHOG_KEY=

# Upstash Redis
UPSTASH_REDIS_REST_URL=
UPSTASH_REDIS_REST_TOKEN=

This allows developers to quickly create their local .env file by copying:

cp .env.template .env

Benefits

• Improves developer onboarding
• Makes the required configuration explicit
• Prevents confusion about missing environment variables