Replace the legacy raw-spreadsheet importer references left behind after
#674 with the canonical import architecture (CanonicalImportOrchestrator +
four loaders) and document #686 index-based PDF resolution.
- l3-backend-3b: DocumentImporter now resolves PDF by index (importDir/
<index>.pdf) with index validation + canonical-path containment + %PDF
magic-byte check (no recursive walk / homoglyph file-path guards)
- c4-diagrams.md: replace massImport/excelSvc components + their rels with
an importOrch (CanonicalImportOrchestrator) component wired to doc/person/
tag services; refresh adminCtrl and adminSystem descriptions
- ARCHITECTURE.md: importing package row now describes the orchestrator +
four loaders consuming canonical artifacts
- TODO-backend.md: remove obsolete "MassImportService provides no status"
item (service deleted; orchestrator already exposes import-status); update
stale ExcelService test-coverage suggestion
Refs #686
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Missing closing braces caused Spring to inject the literal placeholder
string instead of resolving the property, silently ignoring any
app.admin.username / app.admin.password env-var overrides.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>