[Luhaozhu]

This sync brings the generated Community Edition up to date with the current shared runtime and file-preview implementation.

Compared with public main, it includes:

• Canvas PDF, document, code, image, audio and video viewers, with find, document outlines, zoom and file-selection quotes in chat.
• Byte-range media downloads, broader Office preview support, and quote preservation for queued messages.
• Runtime and capability module reorganization, database worker-thread handling, execution status updates, and automation outcome handling.
• MCP 2.x dependency alignment, reorganized Docker inputs, sandbox subprocess cleanup, and a matching CE dependency lock for the PDF viewer.

The generated diff contains 2,834 changed paths, including substantial module moves. This is a complete snapshot sync against main and overlaps the unmerged updates in #208 and #209; it includes their shared upstream changes. It does not merge either PR automatically.

Validation:

• CE required-file, exclusion, binary allowlist, branding and license gates passed.
• CE import, OpenAPI and ORM boundary checks passed.
• Executable CE release and sandbox regression checks passed.
• CE clean dependency installation and production frontend build passed.
• git diff --check passed.

The public tree contains only the generated CE output; enterprise-only implementation, internal deployment material and local credentials are excluded.