Fix v2 Go module path

[Areson]

Why

The withdrawn v2.0.0 tag could not be resolved as a Go module because the module path did not include the /v2 suffix required for major versions two and later. This correction makes the first usable v2 release v2.0.1.

What

• Change the root module and all internal imports to github.com/cashapp/blip/v2.
• Update nested example modules, documentation imports, and pkg.go.dev links for the v2 path.
• Set the release candidate version to 2.0.1 and document the withdrawn v2.0.0 release.

Risk

High compile-time migration impact by design: v2 consumers must update their import paths. No runtime behavior changes are included. Local builds, vetting, non-database tests, nested example tests, the Hugo build, and an isolated consumer-module import test pass. The full local test suite remains gated by the unavailable MySQL test container; GitHub CI is the clean-environment gate.

References

• Go Modules: Major version suffixes
• Release v2.0.0 #178

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