docs(go): add godoc for pipeline and store exports

Уточнение godoc ExtractCIDRs; тесты repository (interface + optional integration).

Co-authored-by: Cursor <[email protected]>

internal/pipeline/parse.go

@@ -39,7 +39,7 @@ func ParseCIDRLines(body string) []netip.Prefix {
 	return out
 }
 
-// ExtractCIDRs parses CIDRs from either plaintext lines or JSON payload.
+// ExtractCIDRs parses CIDR prefixes from plaintext lines or a JSON payload (see sourceKind and prefixPath).
 // For sourceKind="json", prefixPath supports dotted traversal, with [] for arrays:
 // e.g. "prefixes[]", "data.items[].cidr".
 func ExtractCIDRs(body, sourceKind, prefixPath string) ([]netip.Prefix, error) {