feat: add test database setup and usage helpers

- Introduced a new test file for setting up an in-memory SQLite database for testing purposes.
- Added helper functions for seeding test data, including users, plans, subscriptions, and wallet transactions.
- Implemented usage helpers to load user video counts and storage usage.
- Created user payload struct and functions to build user payloads with preferences and wallet balance.
- Refactored gRPC server setup to include new services and handlers.
- Updated proto files to simplify service definitions by removing redundant service prefixes.

proto/agent/v1/woodpecker.proto

@@ -0,0 +1,186 @@
+// Copyright 2021 Woodpecker Authors
+// Copyright 2011 Drone.IO Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+option go_package = "go.woodpecker-ci.org/woodpecker/v3/rpc/proto";
+package proto;
+
+// !IMPORTANT!
+// Increased Version in version.go by 1 if you change something here!
+// !IMPORTANT!
+
+// Woodpecker Server Service
+service Woodpecker {
+  rpc Version         (Empty)                returns (VersionResponse) {}
+  rpc Next            (NextRequest)          returns (NextResponse) {}
+  rpc Init            (InitRequest)          returns (Empty) {}
+  rpc Wait            (WaitRequest)          returns (WaitResponse) {}
+  rpc Done            (DoneRequest)          returns (Empty) {}
+  rpc Extend          (ExtendRequest)        returns (Empty) {}
+  rpc Update          (UpdateRequest)        returns (Empty) {}
+  rpc Log             (LogRequest)           returns (Empty) {}
+  rpc RegisterAgent   (RegisterAgentRequest) returns (RegisterAgentResponse) {}
+  rpc UnregisterAgent (Empty)                returns (Empty) {}
+  rpc ReportHealth    (ReportHealthRequest)  returns (Empty) {}
+  
+  // New Streaming RPCs
+  rpc StreamJobs      (StreamOptions)        returns (stream Workflow) {}
+  rpc SubmitStatus    (stream StatusUpdate)  returns (Empty) {}
+}
+
+//
+// Basic Types
+//
+
+message StepState {
+  string step_uuid = 1;
+  int64  started = 2;
+  int64  finished = 3;
+  bool   exited = 4;
+  int32  exit_code = 5;
+  string error = 6;
+  bool   canceled = 7;
+}
+
+message WorkflowState {
+  int64  started = 1;
+  int64  finished = 2;
+  string error = 3;
+  bool   canceled = 4;
+}
+
+message LogEntry {
+  string step_uuid = 1;
+  int64  time = 2;
+  int32  line = 3;
+  int32  type = 4; // 0 = stdout, 1 = stderr, 2 = exit-code, 3 = metadata, 4 = progress
+  bytes  data = 5;
+}
+
+message Filter {
+  map<string, string> labels = 1;
+}
+
+message Workflow {
+  string id = 1;
+  int64 timeout = 2;
+  bytes payload = 3;
+  bool cancel = 4;
+}
+
+//
+// Request types
+//
+
+message NextRequest {
+  Filter filter = 1;
+}
+
+message InitRequest {
+  string id = 1;
+  WorkflowState state = 2;
+}
+
+message WaitRequest {
+  string id = 1;
+}
+
+message DoneRequest {
+  string id = 1;
+  WorkflowState state = 2;
+}
+
+message ExtendRequest {
+  string id = 1;
+}
+
+message UpdateRequest {
+  string id = 1;
+  StepState state = 2;
+}
+
+message LogRequest {
+  repeated LogEntry logEntries = 1;
+}
+
+message Empty {
+}
+
+message ReportHealthRequest {
+  string status = 1;
+}
+
+message AgentInfo {
+  string platform = 1;
+  int32  capacity = 2;
+  string backend  = 3;
+  string version  = 4;
+  map<string, string> customLabels = 5;
+}
+
+message RegisterAgentRequest {
+  AgentInfo info = 1;
+}
+
+//
+// Response types
+//
+
+message VersionResponse {
+  int32  grpc_version   = 1;
+  string server_version = 2;
+}
+
+message NextResponse {
+  Workflow workflow = 1;
+}
+
+message RegisterAgentResponse {
+  string agent_id = 1;
+}
+
+message WaitResponse {
+  bool canceled = 1;
+};
+
+// Woodpecker auth service is a simple service to authenticate agents and acquire a token
+
+service WoodpeckerAuth {
+  rpc Auth          (AuthRequest)          returns (AuthResponse) {}
+}
+
+message AuthRequest {
+  string agent_token = 1;
+  string agent_id    = 2;
+  string hostname    = 3;
+}
+
+message AuthResponse {
+  string status        = 1;
+  string agent_id      = 2;
+  string access_token  = 3;
+}
+
+message StreamOptions {
+  Filter filter = 1;
+}
+
+message StatusUpdate {
+   string step_uuid = 1;
+   int64  time = 2;
+   int32  type = 3; // 0=stdout, 1=stderr, 2=exit-code, 3=metadata, 4=progress, 5=system-resource
+   bytes  data = 4;
+}