feat(storage): add PatchSBOMAnnotations RPC and StorageClient wrapper

[matthyx]

Summary

Implements the server-side RPC and client wrapper proposed in https://github.com/armosec/private-node-agent/issues/464.

• StorageService Proto:
  • Adds PatchSBOMAnnotations(PatchSBOMAnnotationsRequest) returns (PatchSBOMAnnotationsResponse) to StorageService.
  • Defines PatchSBOMAnnotationsRequest with image_digest, syft_version, set (map<string, string>), and delete (repeated string).
  • Defines PatchSBOMAnnotationsResponse with success, error_message, error_code, and sbom_metadata (SBOMMetadata).
  • Regenerates proto bindings with make proto.
• StorageClient Wrapper:
  • Implements PatchSBOMAnnotations(ctx context.Context, imageDigest, syftVersion string, set map[string]string, del []string) (*proto.SBOMMetadata, error) on *StorageClient.
• Unit Tests:
  • Adds tests for PatchSBOMAnnotations in storageclient_test.go covering successful set/delete merge, server-side failure responses, disconnected client error, and timeout handling.

Verification

• make proto generated bindings cleanly.
• go test ./... passes all test suites.

[coderabbitai]

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[matthyx]

Reviewed the proto additions, generated bindings, and the StorageClient.PatchSBOMAnnotations wrapper.

• PatchSBOMAnnotations follows the exact same shape as the other unary wrappers in this file (withMetadata + callTimeout + Success check), so it's consistent with the rest of the client.
• Proto changes are additive only (new RPC + two new messages, no field renumbering), so no wire compatibility concerns.
• ERROR_CODE_SBOM_NOT_FOUND used in the test already exists in the ErrorCode enum, so that assertion is valid.
• Tests cover the success/merge path, server-side failure, disconnected client, and call-timeout behavior — matches the coverage style of the neighboring GetSBOMStream tests.

Nit (non-blocking): the proto comment for PatchSBOMAnnotationsRequest doesn't say what happens when the same key appears in both set and delete. Worth a one-line doc clarification for whoever implements the server side, but not something to hold up this PR for.

No blockers found — this looks good to merge. Note: I couldn't submit a formal "Approve" review since GitHub doesn't allow approving your own pull request (this bot account is the PR author); flagging that here as the approval signal instead.