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.

internal/version/version.go

@@ -0,0 +1,23 @@
+// Package version holds build metadata injected at link time via -ldflags.
+package version
+
+// Link-time variables (defaults for local development).
+var (
+	Version   = "dev"
+	GitSHA    = "unknown"
+	BuildTime = ""
+)
+
+// Info returns build metadata, substituting safe defaults for empty values.
+func Info() (ver, gitSHA, buildTime string) {
+	ver = Version
+	if ver == "" {
+		ver = "dev"
+	}
+	gitSHA = GitSHA
+	if gitSHA == "" {
+		gitSHA = "unknown"
+	}
+	buildTime = BuildTime
+	return ver, gitSHA, buildTime
+}