[codex] EasyCord v4.1 release

[rolling-codes]

This PR carries the EasyCord v4.1 release work into the main branch.

What changed:

• bumped the package and release docs to v4.1
• added Cog and GroupCog plus cog registration helpers
• added extension loading and reloading support
• added IntegrationPlugin, GuildPlugin, and JsonConfigPlugin helpers
• added AnnouncementsPlugin and AutoReplyPlugin reference plugins
• added endpoint decorators for reusable plugin integration points
• added release automation and fixed release/test workflow dependency installation
• integrated the approved performance and usability guide from PR docs: add performance and usability guide #27

Validation:

• pytest: 472 passed
• python -m compileall easycord examples docs tests
• python -m build

GitHub release v4.1 has already been published from this branch.

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Reviewer's Guide

Introduces a lightweight localization system (LocalizationManager) wired through Bot, Context, and Composer, and leverages it to localize built‑in guard/permission error messages while updating docs, exports, tests, and version metadata for the 3.1.3 release.

Sequence diagram for localized guard error responses via ctx.t and LocalizationManager

sequenceDiagram
  actor User
  participant Discord
  participant Bot
  participant Ctx as Context
  participant LM as LocalizationManager

  User->>Discord: Invoke slash command
  Discord->>Bot: Send interaction
  Bot->>Ctx: Wrap interaction as ctx
  Ctx->>Ctx: Guard checks (guild_only / permissions / cooldown)
  Ctx-->>Bot: Guard fails
  Ctx->>Ctx: t("errors.guild_only", default)
  Ctx->>LM: format(key, locale, guild_locale, default, kwargs)
  LM-->>Ctx: Localized error message
  Ctx->>Discord: respond(ephemeral, content)
  Discord-->>User: Show localized error text

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Class diagram for LocalizationManager integration with Bot, Composer, and Context

classDiagram

class LocalizationManager {
  - str default_locale
  - dict~str, dict~str~ _catalogs
  + __init__(default_locale, translations)
  + register(locale, translations) void
  + locales() list~str~
  + resolve_chain(locale, guild_locale) list~str~
  + get(key, locale, guild_locale, default) str
  + format(key, locale, guild_locale, default, **kwargs) str
}

class Bot {
  + LocalizationManager localization
  + LocalizationManager i18n
  + __init__(intents, auto_sync, localization, default_locale, translations)
}

class Composer {
  - LocalizationManager _localization
  - str _default_locale
  - dict~str, dict~str~ _translations
  + localization(localization) Composer
  + i18n(localization) Composer
  + default_locale(locale) Composer
  + translations(translations) Composer
  + build() Bot
}

class BaseContext {
  + interaction
  + locale
  + guild_locale
  + t(key, default, locale, guild_locale, **kwargs) str
}

Bot *-- LocalizationManager : owns
Composer ..> LocalizationManager : configures
Composer --> Bot : build()
BaseContext ..> LocalizationManager : uses via interaction.client

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File-Level Changes

Change	Details	Files
Add a reusable localization manager and integrate it with Bot and Context for locale-aware strings.	Introduce LocalizationManager helper with locale normalization, fallback chains, lookup, and formatting utilities. Wire Bot.init to create/manage a LocalizationManager instance and expose it as bot.localization and bot.i18n, configurable via constructor args. Expose ctx.locale and ctx.guild_locale from the underlying interaction and add ctx.t(...) to resolve translated strings via the bot's LocalizationManager with safe fallbacks. Export LocalizationManager from the top-level easycord package and document the new localization APIs in the public docs and README.	easycord/i18n.py easycord/bot.py easycord/_context_base.py easycord/composer.py easycord/__init__.py docs/api.md README.md model.md
Update built-in command guard and permission error messages to use localization instead of hardcoded English strings.	Replace literal English error responses in slash command guard logic with ctx.t(...) calls using structured error keys and format parameters. Ensure cooldown and permission-related responses can be translated when a LocalizationManager is configured. Add tests to verify that localized strings are used when a locale/catalog is provided and that sensible defaults remain when no localization manager is present.	easycord/_bot_commands.py tests/test_bot.py tests/test_context.py
Extend the Composer to configure localization on constructed Bot instances.	Add Composer fields for localization manager instance, default locale, and initial translations mapping. Provide fluent Composer methods .localization()/.i18n(), .default_locale(), and .translations() to seed localization at build time. Ensure Composer.build() forwards localization configuration into the Bot and add tests to confirm default manager creation and translation seeding.	easycord/composer.py tests/test_composer.py
Update documentation, package metadata, and exports for the 3.1.3 release with localization and validation changes.	Revise release notes for version 3.1.3, adding highlights, usage guidance, and updated pytest invocation including new tests. Mention LocalizationManager and ctx.t(...) in the API docs and README, and update feature tables and signatures accordingly. Expose LocalizationManager in package exports and ensure tests assert its presence. Bump project version from 3.1.2 to 3.1.3 in pyproject.toml and update model/roadmap notes to reflect new features.	docs/release-notes.md docs/api.md README.md model.md pyproject.toml easycord/__init__.py tests/test_package_exports.py tests/test_i18n.py

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[rolling-codes]

Triage note: this draft release PR is obsolete/conflicting now that main already contains the v4.1 release work. PR #29 is based on current main and carries the issue fixes plus the requested auto-fix workflow.