Add .env.example for developer documentation

[Laurc2004]

Severity: LOW

Problem

The project has no .env.example file. While the app uses minimal environment variables (TAURI_DEV_HOST, TAURI_ENV_PLATFORM, TAURI_DEBUG), a .env.example would help new contributors understand what environment variables are available.

Proposed Solution

Create .env.example:

# Optional: Override the dev server host (used by Tauri during development)
# TAURI_DEV_HOST=

# Automatically set by Tauri CLI during build
# TAURI_ENV_PLATFORM=
# TAURI_DEBUG=

References

• Tracked in PLAN.md item Add .env.example for developer documentation #22