Preserve sideload tool-call metadata

[BrainSlugs83]

Summary

Fixes sideloaded/BYO ONNX model tool-call metadata propagation. inference_model.json can now declare optional oolCallStart, oolCallEnd, and supportsToolCalling; unresolved local models synthesized in catalog Step 4 preserve those values in ModelInfo.

Root cause

Sideloaded models could not produce structured delta.tool_calls because their metadata was dropped before inference:

1. local_model_scanner.cc only read Name from inference_model.json and returned model_id -> path.
2. catalog_client.cc Step 4 synthesized unresolved BYO ModelInfo entries with only basic Local/ONNX properties.
3. Tool-call marker properties were absent, so chat request/session setup passed empty markers.
4. ToolCallStreamAccumulator intentionally treats empty markers as passthrough text, so no structured tool calls were surfaced.

Fix

• Added ScanLocalModelInfos() to return local path plus optional tool-call metadata.
• Kept existing ScanLocalModels() as a compatibility wrapper returning model_id -> path.
• Added an overload of FetchAllModelInfosWithCachedModels() that accepts scan metadata.
• Threaded metadata from AzureModelCatalog::FetchModels() into BYO synthesis.
• Copied oolCallStart, oolCallEnd, and supportsToolCalling into synthesized BYO ModelInfo only when present, preserving previous absent-field passthrough behavior.

Validation

Commit: $commit

Built on Windows with:

powershell python .\build.py --build --skip_tests --skip_examples --skip_service --config RelWithDebInfo --parallel 4 --cmake_path 'C:\Program Files\Microsoft Visual Studio\18\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe' --ctest_path 'C:\Program Files\Microsoft Visual Studio\18\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\ctest.exe' --vcpkg_root 'C:\Program Files\Microsoft Visual Studio\18\Community\VC\vcpkg'

Targeted unit tests passed on the committed tree:

powershell .\build\Windows\RelWithDebInfo\bin\RelWithDebInfo\foundry_local_tests.exe --gtest_filter='LocalModelScannerTest.*:StaticCatalogClientTest.BYOModel_SynthesizedWhenNotInSnapshot'

Result: 13 tests passed.

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