Add document converter, seeder data structure, and project wiki

- ai-service/convert.py: converts Office/PDF files to markdown with frontmatter
- database/seeders/data/: folder structure for themas, projects, documents, etc.
- database/seeders/data/raw/: drop zone for Office/PDF files to convert
- wiki/: project architecture, concepts, and knowledge graph documentation
- Remove unused Laravel example tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

wiki/index.md

@@ -0,0 +1,34 @@
+---
+title: Wiki Index
+created: 2026-04-08
+updated: 2026-04-08
+---
+
+# Innovatieplatform Wiki Index
+
+## Overview
+- [Project Overview](overview.md) — current status, what works, what doesn't
+- [Metrics Dashboard](metrics.md) — all numbers with provenance
+- [Knowledge Graph](knowledge-graph.yaml) — structured data, machine-queryable
+
+## Architecture
+- [System Architecture](architecture/system-architecture.md) — layers, services, data flow
+- [Domain Model](architecture/domain-model.md) — entities, relationships, lifecycle states
+- [Metro Map UI](architecture/metro-map-ui.md) — D3 canvas, zoom dimensions, interaction model
+
+## Core Concepts
+- [Innovation Lifecycle](concepts/innovation-lifecycle.md) — phases from signaal to evaluatie
+- [AI Integration](concepts/ai-integration.md) — RAG pipeline, LangGraph, agent skills
+
+## Findings
+<!-- Add findings pages — both proven AND disproven -->
+
+## Sessions
+- [2026-04-08 Wiki Setup](sessions/2026-04-08-wiki-setup.md) — initial wiki from template, codebase scan
+
+## Not Yet Documented
+- RBAC model and permission matrix
+- Handover process (overdracht) details
+- Budget/finance governance
+- Student projects (Phase 2)
+- Deployment pipeline / CI/CD