chore[qvac-lib-inference-addon-cpp]: drop unused project VERSION

[jpgaribotti]

🎯 What problem does this PR solve?

• The VERSION in CMakeLists.txt (project(... VERSION 1.1.4 ...)) keeps drifting from the version in vcpkg.json (currently 1.1.5), creating two sources of truth for the package version.
• The CMake-side version is effectively dead code: it only feeds write_basic_package_version_file() to generate qvac-lib-inference-addon-cppConfigVersion.cmake, which is never consumed — no downstream package calls find_package(qvac-lib-inference-addon-cpp <version> ...). All consumers (qvac-lib-infer-llamacpp-llm, -embed, -whispercpp, -nmtcpp, -parakeet, -onnx-tts, diffusion-cpp, bci-whispercpp, ocr-onnx) locate headers via find_path(QVAC_LIB_INFERENCE_ADDON_CPP_INCLUDE_DIRS "qvac-lib-inference-addon-cpp/...hpp").

📝 How does it solve it?

• Drop VERSION 1.1.4 from the project() call in CMakeLists.txt.
• Drop the write_basic_package_version_file() call and the install of the generated qvac-lib-inference-addon-cppConfigVersion.cmake. The Config.cmake (without version) is still generated and installed for any future find_package consumers.
• Bump vcpkg.json version 1.1.5 → 1.1.6 so the cleanup ships as a new port version. vcpkg.json remains the single source of truth for the package version.

🧪 How was it tested?

• Verified via repo-wide grep that no find_package(qvac-lib-inference-addon-cpp ...) call exists; all consumers use find_path for header discovery.
• All version constraints in dependent packages ("version>=": "1.1.x" in their vcpkg.jsons and ≥1.1.x mentions in CHANGELOGs/READMEs) target the vcpkg.json version, which remains intact.

[jpgaribotti]

/review

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ✅ (1/1)
- 1 Team Lead OR Management approval ✅ (1/1)



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