Invite: grant every feature's required permissions (no Administrator)

[HiLleywyn]

Why

The server-tools bot's invite was too slim: the least-privilege set in clanklib/permissions.py was missing two permissions the bot genuinely uses, so those actions failed after a fresh invite.

What was missing (mapped to the code that needs it)

Permission	Feature	Code
manage_guild	Restore server-level settings (name, verification level, content filter, AFK timeout) on backup/template restore	clanklib/serializer.py:406-420 (guild.edit(...))
attach_files	.export sends the backup as a JSON file (backup-<id>.json)	cogs/importexport.py:42-45

Change

• Added manage_guild to the Backups and templates feature and attach_files to Core in clanklib/permissions.py (the single source of truth that drives the invite link, the .setup audit, and the manifest).
• Manifest/invite value moves 805391380 → 805424180. Still no Administrator.
• auren.json, docs/deployment.md, and CHANGELOG.md updated to match.

Verification

• Audited the serializer + cogs (create_role/create_*_channel/create_webhook/guild.edit/ban/discord.File); every call now maps to a granted permission. No emoji/sticker restore, threads, or invites exist, so nothing else is needed.
• FEATURES union recomputed to 805424180 and confirmed equal to auren.json — the existing test_manifest_permissions_match_required keeps them in lockstep, and test_invite_requests_minimal_not_administrator still holds (manage_webhooks/ban_members present, no Administrator).

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