Add AIServer, character art pipeline, and Art package boot integration.

Bring in MaleExplorer assets/shaders, model tooling and Hunyuan updates, plus boot/YooAsset Art package support.

Co-authored-by: Cursor <cursoragent@cursor.com>

AIServer/src/db.hpp

@@ -0,0 +1,44 @@
+#pragma once
+#include <cstdint>
+#include <optional>
+#include <string>
+
+struct sqlite3;
+
+namespace db {
+
+struct User {
+  int64_t pid = 0;
+  std::string username;
+  std::string password_hash;
+  std::string salt;
+};
+
+class Database {
+ public:
+  explicit Database(const std::string& path);
+  ~Database();
+
+  Database(const Database&) = delete;
+  Database& operator=(const Database&) = delete;
+
+  bool open_ok() const { return db_ != nullptr; }
+  const std::string& last_error() const { return err_; }
+
+  // returns pid on success
+  std::optional<int64_t> create_user(const std::string& username, const std::string& password_hash,
+                                     const std::string& salt);
+  std::optional<User> find_user_by_name(const std::string& username);
+  std::optional<User> find_user_by_pid(int64_t pid);
+
+  bool store_token(const std::string& token, int64_t pid, int64_t created_at, int64_t expires_at);
+  std::optional<int64_t> pid_for_token(const std::string& token);
+  void purge_expired_tokens(int64_t now);
+
+ private:
+  bool exec(const char* sql);
+  sqlite3* db_ = nullptr;
+  std::string err_;
+};
+
+}  // namespace db