chore(fmt): repo-wide gofmt -w sweep — close drift surfaced by ci-pipeline-cleanup Phase 4

Mechanical reformat. The new 'gofmt drift' CI step (added in
ci-pipeline-cleanup Phase 4, commit 0f205a8) surfaced 111 files
with accumulated gofmt drift across cmd/, internal/, and deploy/test/.

Each file's diff is gofmt-standard: whitespace adjustments, intra-
group import sorting (alphabetical by import path within blank-line-
separated groups), and struct-tag column alignment. No semantic
changes — verified via 'git diff --ignore-all-space' which shows only
the line-position deltas from import reordering.

The gate stays in place after this commit. Going forward it catches
gofmt drift at PR time.

internal/connector/issuer/vault/vault.go

@@ -86,9 +86,9 @@ func New(config *Config, logger *slog.Logger) *Connector {
 
 // vaultResponse is the standard Vault API response wrapper.
 type vaultResponse struct {
-	Data    json.RawMessage `json:"data"`
-	Errors  []string        `json:"errors,omitempty"`
-	Warnings []string       `json:"warnings,omitempty"`
+	Data     json.RawMessage `json:"data"`
+	Errors   []string        `json:"errors,omitempty"`
+	Warnings []string        `json:"warnings,omitempty"`
 }
 
 // signData holds the data returned from the /sign endpoint.