Summary

Consolidates the outstanding uncommitted accordserver work into a single PR.

• Plugin leaderboards — new storage layer (src/db/plugin_leaderboards.rs) plus SQLite + Postgres migrations (024 / 009), and models/plugin.rs additions.
• Plugins routes — expanded src/routes/plugins.rs and src/db/plugins.rs.
• Members — new endpoints in src/routes/members.rs and supporting src/db/members.rs queries.
• Invites / spaces / auth — refinements across src/routes/invites.rs, src/routes/spaces.rs, src/routes/auth.rs.
• MCP — tool-surface edits in src/mcp/tools.rs.

Notes

• Rebased onto master after the 0.1.27 release (mention-counting / read-state PR feat(messages): mention counting, read-state sync & space_id in unreads #27 + channel-type changes). Two conflicts in src/db/members.rs and src/mcp/tools.rs were resolved to keep the merged read-state code.
• A separate stale WIP stash ("improve CORS") was an earlier draft of the read-state/ack/unread feature already shipped in feat(messages): mention counting, read-state sync & space_id in unreads #27, so it was dropped rather than included.
• cargo check passes.

Test plan

• cargo check / cargo test
• Run plugin-leaderboard migrations (SQLite + Postgres) and exercise the new endpoints
• Smoke-test plugins / members / invites / spaces routes

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