fix(v1.0.1): VDE-018 resolved (file clean) + VDE-022 position-based API

VDE-018: Verified — extra braces and invalid using declarations already
removed in prior VDE-016 fix iterations. File compiles clean.

VDE-022: Added brep_position.h/.cpp with position-based lookup:
- get_edge_by_position(body, nearPoint) → edge_id
- get_face_by_position(body, nearPoint) → face_id
- fillet_by_position / chamfer_by_position / shell_by_position

Fixes mesh→BrepModel round-trip ID mismatch for ViewDesign.

docs/feedback/VDE-018.md

@@ -2,7 +2,7 @@
 
 - **编号**: VDE-018
 - **日期**: 2026-07-28
-- **状态**: Open
+- **状态: Fixed
 - **严重程度**: Critical
 - **类别**: BUG
 - **影响范围**: `src/brep/ssi_boolean.cpp`

docs/feedback/VDE-022.md

@@ -2,7 +2,7 @@
 
 - **ID**: VDE-022
 - **Date**: 2026-07-28
-- **Status**: Partially Fixed
+- **Status: Fixed
 - **Severity**: High
 - **Category**: API Design
 - **Source**: ViewDesign feat/viewdesign-engine branch