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Adds the reference README for the Flow Vault Go SDK introduced in #205 (stacked on #203), and updates the v2 docs for the shared Env change in that PR.

Why

• SK-3223, SK-3233 implementation of new flowvault interfaces in go sdk #205 adds the flowvault module with nine operations, but its only docs are the samples README. The PR lists flowvault/README.md as a follow-up.
• SK-3223, SK-3233 implementation of new flowvault interfaces in go sdk #205 also changes v2 behavior through common/config. Env now starts at 1, so the zero value means "not set" and resolves to PROD. UpdateVaultConfig now keeps the current Env when an update doesn't set one.

Goal

• flowvault/README.md: install (including the local replace until the module is published), quickstart, credentials, client and vault configuration, one section per operation (Insert, Update, Get, Delete, Detokenize, GetTokens, Query, UploadFiles, DeleteFiles), timeouts and retries, per-call headers through Interceptor, client management, and per-record and whole-call error handling. The structure follows the Python Flow Vault README.
• samples/flowvault/README.md: links to the new README.
• README.md and docs/api_reference.md (v2): UpdateVaultConfig changes only the ClusterId, Env, and Credentials you set. An unset Env resolves to PROD, and the README no longer calls DEV the default.
• Non-goals: Fern docs site pages. The Flow Vault section there is internal-only.

Testing

• All claims and snippets were checked by reading the source at ac53bc9. No code was built or run.
• Sample links point to main, so they resolve only after the stack merges.

Trigger Events

• skyflowapi/skyflow-go PR #205: SK-3223 implementation of new flowvault interfaces in go sdk

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I noticed that some CI checks failed for this PR. I'm investigating whether the failures are caused by this suggestion. If they're unrelated or pre-existing, I'll leave this suggestion unchanged and create a separate suggestion if a standalone docs fix is needed.