Custom endpoint setup (_model_flow_custom) now probes the server first and presents detected models instead of asking users to type blind: - Single model: auto-confirms with Y/n prompt - Multiple models: numbered list picker, or type a name - No models / probe failed: falls back to manual input Context length prompt also moved after model selection so the user sees the verified endpoint before being asked for details. All recent fixes preserved: config dict sync (#4172), api_key persistence (#4182), no save_env_value for URLs (#4165). Inspired by PR #4194 by sudoingX — re-implemented against current main. Co-authored-by: Xpress AI (Dip KD) <200180104+sudoingX@users.noreply.github.com>
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