HTTP MCP, user invites, and provider resilience

Features

• Added HTTP MCP transport support with catalog browsing and readable HTTP slugs, making it easier to connect and identify MCP servers.
• Introduced a pending user invite flow with no-expiry invites and the ability to regenerate invite links.
• Added support for anonymous config credentials, allowing credential configuration without requiring a named identity.

Improvements

• In-flight jobs are now automatically re-routed to a fallback provider when a rate-limit overload is detected mid-stream, reducing job failures during provider throttling.
• Provider health checks now respect the RateLimitResetsAt expiry timestamp, clearing stale over-quota status instead of blocking traffic unnecessarily.
• Base64-encoded images in tool results are now extracted and promoted to image parts before being sent to the LLM, enabling vision capabilities in tool workflows.
• GPU PEL row reclaim in the queue is now scoped to the correct consumer, preventing cross-consumer interference.

Fixes

• Fixed credential discovery and policy handling for TEXT[] field types.
• Fixed tools-by-code interactive tools, eliminating duplicate messages, correcting reaction handling, and surfacing errors properly.
• Fixed a false error reaction and incorrect integration health status in the Discord integration.
• Corrected org_id assignment on teams and resolved tool schema and documentation inconsistencies.

Internal

• Migrated inline error alerts to a unified AppInlineAlert component across settings, views, and the SSE connection banner for consistent design.