feat(store): миграция sessions/password + методы users/sessions/projects

Фаза 2, Task 1: добавлена таблица sessions и nullable password_hash у
users, sqlc-запросы и *Store-обёртки (CreateUser, GetUserByEmail,
CreateProjectForUser, GetProjectOwned, GetUserProject, CreateSession,
GetSessionUser, DeleteSession, RegisterUser в транзакции), интеграционные
тесты на testcontainers.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BwxdSt4reTm7Dj1oxRvpP3

internal/store/db/projects.sql.go

@@ -0,0 +1,71 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.31.1
+// source: projects.sql
+
+package db
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
+
+const createProject = `-- name: CreateProject :one
+INSERT INTO projects (id, user_id, name) VALUES ($1, $2, $3) RETURNING id, user_id, name, created_at
+`
+
+type CreateProjectParams struct {
+	ID     uuid.UUID `json:"id"`
+	UserID uuid.UUID `json:"user_id"`
+	Name   string    `json:"name"`
+}
+
+func (q *Queries) CreateProject(ctx context.Context, arg CreateProjectParams) (Project, error) {
+	row := q.db.QueryRow(ctx, createProject, arg.ID, arg.UserID, arg.Name)
+	var i Project
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.Name,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const getProjectOwned = `-- name: GetProjectOwned :one
+SELECT id, user_id, name, created_at FROM projects WHERE id = $1 AND user_id = $2
+`
+
+type GetProjectOwnedParams struct {
+	ID     uuid.UUID `json:"id"`
+	UserID uuid.UUID `json:"user_id"`
+}
+
+func (q *Queries) GetProjectOwned(ctx context.Context, arg GetProjectOwnedParams) (Project, error) {
+	row := q.db.QueryRow(ctx, getProjectOwned, arg.ID, arg.UserID)
+	var i Project
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.Name,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const getUserProject = `-- name: GetUserProject :one
+SELECT id, user_id, name, created_at FROM projects WHERE user_id = $1 ORDER BY created_at LIMIT 1
+`
+
+func (q *Queries) GetUserProject(ctx context.Context, userID uuid.UUID) (Project, error) {
+	row := q.db.QueryRow(ctx, getUserProject, userID)
+	var i Project
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.Name,
+		&i.CreatedAt,
+	)
+	return i, err
+}