chore(build): drop pre-project GNUInstallDirs include and add SQLite3::SQLite3 shim

[olantwin]

Summary

Two unrelated but trivial CMake dev warnings that surfaced on every CI configure step. No behaviour change.

• CMakeLists.txt:5 — include(GNUInstallDirs) ran before project(...), which trips a 'no target architecture is known' warning (GNUInstallDirs cannot pick a libdir until a language is enabled). The second include later in the file (after project(... LANGUAGES CXX)) is correctly placed and already provides the install-dir variables used downstream — the pre-project include was redundant.
• apps/CMakeLists.txt:15 — CMake 4.3 renamed the FindSQLite3 target to SQLite3::SQLite3 and marked the old name SQLite::SQLite3 deprecated, so every target_link_libraries resolution against it fired a dev warning. Switch the linkage to SQLite3::SQLite3 and add the alias-shim recommended by the FindSQLite3 docs so the build still works on older CMake (< 4.3) that only ships SQLite::SQLite3.

Test plan

• Configure with conda CMake 4.3 (pixi toolchain) — no CMake Warning (dev) lines from these two files
• Configure with the CVMFS toolchain CMake (still ships SQLite::SQLite3 only) — the shim provides SQLite3::SQLite3 as an alias, so the link succeeds
• Build + 25/25 ctest tests still pass (the segfault under fix(Calorimeter): avoid std::format to work around libstdc++ ABI clash #27 is unrelated to this PR)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: bb5c3db5-46c9-4294-9408-f4036ae27bc2

📥 Commits

Reviewing files that changed from the base of the PR and between cb46f78 and 92dcf84.

📒 Files selected for processing (2)

• CMakeLists.txt
• apps/CMakeLists.txt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/cmake-warnings

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