AyCode.Core/AyCode.Core/Consts/README.md

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# Consts
Project-wide constants, error codes, environment configuration, regex patterns, and input validation.
## Key Files
- **`AcConst.cs`** — Central constants: `ProjectId`/`ProjectSalt` (loaded from appsettings), user/password length limits, TCP/messaging defaults, well-known Guids, `AvailableDomainSuffixes` (300+ TLDs). **Critical:** `GenerateProjectSalt()` must not be modified — it is tied to authentication.
- **`AcEnv.cs`** — Environment access: `AppConfiguration` (lazy-loaded from appsettings.json + env vars), `NL` (newline), `MaxLogItemsPerSession`, `GetEnum<T>()` config helper.
- **`AcErrorCode.cs`** — Byte enum with 60+ error codes (0=UnknownError ... 255=Unset). Used across the entire API layer.
- **`AcRegExpression.cs`** — Compile-time generated regex via `[GeneratedRegex]`: `EmailRegex()` (RFC-compliant), `PhoneNumberRegex()` (E.164 format).
- **`AcValidate.cs`** — Input validation methods returning `bool` + `out AcErrorCode`: email, password, username, player name, phone, domain, user token format checks.