docs: reorganize tree, restore architecture + research from archive, add Phase 0 reports

Active docs/ was stub scaffolding while the real docs sat in docs/_archive/.
Restore and correct them, and record the Phase 0 work.

- docs/architecture/current.md: verified system map (from archived SYSTEM_OVERVIEW,
  9 corrections against code).
- docs/research/competitors.md: sourced competitor analysis (from archived
  PRODUCT_RESEARCH, feature matrix corrected).
- docs/decisions/ADR-002-job-application-model.md: the Job/JobApplication split.
- docs/application-discovery-report.md, docs/implementation-roadmap.md,
  docs/phase-0-foundation-report.md, docs/career-workspace-branch-assessment.md.
- Remove 10 zero-byte placeholder files that advertised content that never existed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/research/recommendations.md

@@ -0,0 +1,61 @@
+# Product Recommendations
+
+## Overall Direction
+
+Jobjakt should become:
+
+A career workspace that helps people successfully manage job applications.
+
+---
+
+# Core Differentiator
+
+Not:
+
+"Create a CV"
+
+Instead:
+
+"Manage your entire job search."
+
+---
+
+# Recommended Priority
+
+## Phase 1
+
+Fix fundamentals:
+
+- Authentication.
+- UX.
+- Job workflow.
+
+---
+
+## Phase 2
+
+Career Workspace:
+
+- Master profile.
+- CV builder.
+- Cover letters.
+
+---
+
+## Phase 3
+
+AI:
+
+- Tailoring.
+- Suggestions.
+- Interview preparation.
+
+---
+
+## Phase 4
+
+SaaS:
+
+- Premium features.
+- Billing.
+- Public profiles.