[lukisch]

Adds reviewed Spanish project documentation and links it from the English and German READMEs, llms.txt and changelog. The change contains documentation only.

Validation on merge commit 8fc5a73807d409ca2349b08de48396ce2d8f1fc2 with base master@805067ff977cffeb1de12e6f965cfcd838c9167e:

• PR scope: exactly five documentation files; the PR diff contains no product-code changes.
• Translations: python manage_translations.py --dir . --check passed. All 1,185 catalog entries are complete in DE, EN, ES, ZH, JA and RU.
• Full test suite: 598 passed, 5 failed, 9 skipped (612 collected, 309.61 seconds; exit code 1), using the existing explorerpro-store environment with QT_QPA_PLATFORM=offscreen.
• Observed failures:
  • tests/test_drive_capacity.py::test_cancelled_drive_query_is_reported_as_unavailable
  • tests/test_drive_capacity.py::test_slow_query_keeps_gui_responsive_and_deduplicates
  • tests/test_drive_capacity.py::test_failed_query_and_recovery
  • tests/test_drive_capacity.py::test_panel_destroyed_while_query_is_running
  • tests/test_drive_query_process.py::test_real_helper_matches_os_capacity (stale entries remained in drive_usage._query_processes).
• Baseline: this result is the run on the merge commit. No clean baseline pass has been established. The earlier translation-branch run also reported 5 failures and 9 skips; it was not a clean baseline rerun.
• PR test: isolate capacity workers between GUI tests #29: its test-isolation work remains separate; no PR test: isolate capacity workers between GUI tests #29 or runtime fix is included here.

Draft pending review and resolution of the application-test failures. No release or merge is requested.

CI readback: run 41445175249 on this exact head failed in all nine matrix jobs at Run Ruff Linting; installation and compilation succeeded, and pytest was skipped. The ten lint diagnostics concern unused imports/one local variable in unchanged archive code/tests. The master run 41135527136 on exact base 805067f fails at the same step with the same diagnostics. This establishes an inherited lint blocker, not a passing pytest baseline. No CI run was restarted and no runtime or lint fix is included in this documentation PR.

[lukisch]

CI-Diagnose: Alle Test-Jobs scheitern am Ruff-Lint (F401 core.archive_service.TarSlipSecurityError imported but unused) in Dateien, die dieser Doku-only-PR nicht berührt. Ursache liegt auf master und wird durch #32 behoben. Nach Merge von #32 Branch rebasen; CI sollte grün werden.

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