chore: add project scaffolding and build tooling

Go module, makefile (build, test, docker, e2e targets), version embedding, initialize script, vars template, ignores and the project plan.

.gitignore

@@ -0,0 +1,11 @@
+.env
+.vars
+data
+/dpsapi
+*.db*
+coverage.out
+*.cov
+e2e/node_modules
+e2e/test-results
+e2e/playwright-report
+e2e/reports