feat: implement versioning and release management in the project

- Added automatic versioning based on git tags using semantic-release in Gitea Actions.
- Introduced new API endpoints `GET /version` and `GET /v1/version` to expose build metadata.
- Updated Docker build process to include version and build time information in Go binaries.
- Enhanced documentation with details on release processes and versioning guidelines.
- Integrated version display in the web application for better user visibility.

.gitignore

@@ -0,0 +1,14 @@
+# Root npm (semantic-release, commitlint) — npm ci in CI, never commit deps
+node_modules/
+
+# Generated by deploy/docker/write-bake-override.sh (CI/local bake)
+deploy/docker/docker-bake.override.hcl
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env / secrets (local only)
+.env
+.env.*
+!.env.example