[leejet]

Summary

• Process --list-devices after argument parsing in both CLI and server, registering RPC endpoints before enumeration regardless of option order.
• Add sd_add_rpc_servers() without changing the existing device-listing API, and return a nonzero exit status when RPC registration fails.
• Restore the RPC device discovery instructions.

Related Issue / Discussion

Fix #2165.

Additional Information

N/A

Checklist

• I have read and confirmed this PR follows the contribution guidelines.

Summary by CodeRabbit

• New Features

  • Added a --list-devices option to display available local and RPC-backed devices, with clear success or failure status.
  • Added support for registering RPC servers through the public API before device enumeration.
  • Device discovery now retries backend lookup when needed and reports unavailable RPC servers.

• Documentation

  • Updated RPC usage guidance with device-connection checks and clarified output and error behavior.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2e2ba3f and e30f7b9.

📒 Files selected for processing: 7

• docs/rpc.md
• examples/cli/main.cpp
• examples/common/common.cpp
• examples/common/common.h
• examples/server/main.cpp
• include/stable-diffusion.h
• src/core/ggml_extend_backend.cpp

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