Remove .env from git and add to gitignore

The .env file contains secrets and should not be in version control.
Users should copy .env.example and configure their own credentials.

Generated with [Claude Code](https://claude.com/claude-code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.env.example

@@ -0,0 +1,8 @@
+# CVAT CONFIGURATION
+CVAT_URL=https://app.cvat.ai
+CVAT_USERNAME=your_username
+CVAT_PASSWORD=your_password
+CVAT_ORGANIZATION=your_organization
+
+# HUGGING FACE CONFIGURATION
+HUGGINGFACE_TOKEN=your_hf_token

.gitignore

@@ -39,3 +39,4 @@ transformers_cache/
 # Don’t ignore model folder (HF needs it)
 # /model/ is intentionally NOT ignored
 sam.code-workspace
+.env