chore: migrate module path from gitlab.com to git.unbound.se

- Update go.mod module path to git.unbound.se/unboundsoftware/dbsetup
- Remove gitlab-ci-linter pre-commit hook (not applicable for Gitea)
- Update go-imports local path for new domain
- Update CLAUDE.md documentation with new paths
- Remove GitLab-specific badges from README.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,53 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+**dbsetup** is a Go helper module for database connection pool initialization with OpenTelemetry (OTEL) instrumentation. It wraps database connections with OTEL to automatically add SQL queries to tracing spans.
+
+- Module path: `git.unbound.se/unboundsoftware/dbsetup`
+- Primary dependencies: sqlx, goose (migrations), otelsqlx (OTEL wrapper)
+
+## Common Commands
+
+```bash
+# Download dependencies
+go mod download
+
+# Run tests with race detection and coverage
+CGO_ENABLED=1 go test -race -coverprofile=coverage.txt ./...
+
+# Generate coverage report
+go tool cover -html=coverage.txt -o coverage.html
+
+# Check for security vulnerabilities
+go install golang.org/x/vuln/cmd/govulncheck@latest
+govulncheck ./...
+
+# Run pre-commit hooks (add all files first)
+git add -A && pre-commit run --all-files
+```
+
+## Architecture
+
+Single-package module with one source file (`database.go`):
+
+- **DatabaseConfig**: Configuration struct with connection URL, driver name, and pool settings. Uses struct tags compatible with kong CLI parser.
+- **Database**: Main handler providing:
+  - `SetupDB()` - Validates database connection and returns Database instance
+  - `Connect()` - Creates OTEL-wrapped connection pool via otelsqlx
+  - `RunMigrations()` - Executes goose migrations from an `fs.FS` filesystem
+
+## Code Quality
+
+Pre-commit hooks enforce:
+- gofumpt formatting (stricter than gofmt)
+- golangci-lint
+- go-imports with local path `git.unbound.se/unboundsoftware/`
+- Conventional commits format (feat:, fix:, chore:, etc.)
+- Gitleaks for secret detection
+
+## CI/CD
+
+GitLab CI pipeline runs: dependency download → tests with race detector → vulnerability scanning → Codecov upload.