docs: refresh README to reflect current addon state (#155)

[Xerrion]

Description

Refreshes README.md so it accurately reflects the addon as it sits on master. The previous README had drifted out of sync with the 0.7-0.13 releases (slash commands missing, supported versions wrong, no mention of the redesigned Options UI / ElvUI handling / DragonWidgets / direct loot history).

No source code changes - documentation only.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Refactor (non-breaking change that improves code quality)
• Documentation update
• Breaking change (fix or feature that would cause existing functionality to change)

Related Issues

Closes #155

Changes

• Fixed Supported Versions table to match DragonLoot.toc exactly (Retail / TBC Anniversary / MoP Classic - no Cata)
• Rebuilt slash-command table to include all 13 verbs (/dl enable, /dl disable, /dl testroll loop, /dl testroll stop, etc.) plus aliases
• Rewrote Features section to cover the 0.7-0.13 additions (ElvUI conflict detection, redesigned tabbed Options UI, DragonWidgets, expanded appearance, direct loot history via CHAT_MSG_LOOT)
• New Sub-addons section documenting DragonLoot + DragonLoot_Options (LoadOnDemand)
• New ElvUI Compatibility section
• New Localization section listing the 11 shipped locales
• Expanded Contributing to mention just, mise, luacheck, busted, stylua
• Fixed License link from main to master
• Added CurseForge and Wago badges/links

Testing

• Luacheck passes (luacheck .) - no source changes, but verified clean
• Tested in-game manually - N/A, documentation only
• WoW version(s) tested on: N/A - documentation only

All claims in the README were verified against current source on master:

• Supported Versions table cross-checked against DragonLoot/DragonLoot.toc
• Slash commands cross-checked against DragonLoot/Core/SlashCommands.lua
• Features cross-checked against the 0.7-0.13 changelog and current source
• Tables align; no em/en dashes
• Links use master branch where applicable

Screenshots

N/A - documentation only.

Checklist

• My code follows the project's code style (4-space indent, 120 char lines)
• I have tested my changes in-game (N/A - docs only)
• Luacheck reports no warnings
• My commits follow conventional commit format

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📥 Commits

Reviewing files that changed from the base of the PR and between c337e94 and 11c2028.

📒 Files selected for processing (1)

• README.md

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