[LNPANDY]

Prepares NX2Apple v1.5.0 release metadata ahead of tagging v1.5.0-rc1:

1. Bump AppUpdateStore.appVersion (Swift) and APP_VERSION (Qt) from 1.4.0 to 1.5.0.
2. Add v1.5.0 rows to CHANGELOG.md and CHANGELOG.zh-CN.md summarizing PRs patches: synthesize docs/env_switches.tsv and drop 14 obsolete patches #1214, patches: squash fix-on-fix fork patches (75 to 42) and move DmShell to frontend-ios #1215, Launcher & ShellHost: externalize oversized msl shaders, repack shared IPA, and batch-transfer games #1216, ShellHost & Launcher: hot-load signed game frameworks from Documents/Frameworks #1217, chore(engine): sync upstream to 0c078130f6db #1226, and fix(engine): inherit aliased virtual pool flags and bound sampler pool IDs #1227 (upstream pin 0c078130, shader chain a5e7fb6e4fa4, 44 patches, and nvn: inherit aliased virtual pool flags and bound sampler pool IDs seedds/nxnative#2519 / Super Mario Party (010036B0034E4000): missing CPU-written textures in aliased virtual pools, unregistered sampler ID 4095, and GPU hang at frame 4726 seedds/nxnative#2513).
3. Add bilingual release-notes/v1.5.0.md checked with tools/release_notes.py check.

Verification:

• python3 tools/release_notes.py check release-notes/v1.5.0.md (ok)
• test_release_notes.py (21 tests OK), test_app_version.py (3 tests OK), test_app_update.py (11 tests OK)
• pre-push full gate passed (505 Qt front-end tests and full Swift launcher test suite)