chore(release): bump SDK for openYuanRong 0.9.9

[WenYuLuo]

Summary

• bump akernel-sdk from 0.1.4 to 0.1.5 for the dependency update release
• pin the openYuanRong runtime binary and core wheels to 0.9.9 with the verified release SHA-256 values
• pin the openyuanrong-sandbox and optional openyuanrong-sdk Python distributions to 0.9.9
• update the src/yuanrong gitlink to the 0.9.9 release tag
• keep the existing AKernel SDK storage API unchanged

openYuanRong 0.9.9 highlights

Compared with the previously pinned 0.9.7 release, the main AKernel-relevant changes are:

• Reverse tunnel protocol v2: streams large HTTP request and response bodies as bounded binary chunks instead of one buffered JSON payload, negotiates body/chunk/concurrency/window limits, retains V1 fallback, and supports resumable in-process tunnel sessions. The default negotiated HTTP body limit is 512 MiB, with 64 KiB stream chunks and a separate 8 MiB WebSocket-message limit. See yuanrong !965, yuanrong !977, and sandbox-sdk !22.
• Effective reverse-tunnel HTTP timeout: YR_TUNNEL_HTTP_TIMEOUT is now applied consistently to Rust RRT V1/V2 waits and both Python tunnel clients, preserving the 600-second default and returning 504 for timed-out upstream HTTP work. This is separate from the WebSocket connection timeout. See yuanrong !984 and sandbox-sdk !25.
• Sandbox SDK and file operations: Python tunnel APIs are aligned with protocol v2; connection settings can be provided through an immutable ConnectionConfig; uploads can preserve file permissions; and Frontend can query an agent instance file tree. See sandbox-sdk !23, yuanrong !966, and yuanrong !964.
• Runtime and deployment options: deployments can run without DataSystem, Frontend-to-FunctionProxy direct routing is available, and CLI startup preserves invoke-routing configuration. See yuanrong !894, yuanrong !944, yuanrong !954, and yuanrong !976.
• Reliability fixes: includes fixes for interrupted-call response parsing, Frontend direct-create propagation, Python runtime restore overwriting metrics exporters, Redis-backed scheduler session handling, and Docker sandbox graceful-shutdown behavior. See yuanrong !959, yuanrong !962, yuanrong !963, yuanrong !956, and yuanrong !980.

Upstream 0.9.9 also contains writable-storage-limit support in sandbox-sdk. This PR intentionally keeps the current AKernel public storage API unchanged; any such API adaptation should be reviewed separately.

Full upstream comparison: openYuanRong 0.9.7...0.9.9.

Validation

• 245 Python unit tests passed with openyuanrong-sandbox==0.9.9
• Ruff passed
• mypy passed for 25 source files
• akernel_sdk-0.1.5 sdist and wheel build passed
• runtime-rrt Docker target build passed
• official 0.9.9 release artifact SHA-256 values were verified
• git diff --check passed