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/tools/search.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Search the wiki — usable by both humans and LLM agents
+# Usage: ./wiki/tools/search.sh "query" [--files-only]
+
+WIKI_DIR="$(dirname "$(dirname "$(readlink -f "$0")")")"
+QUERY="$1"
+MODE="${2:---content}"
+
+if [ -z "$QUERY" ]; then
+    echo "Usage: $0 <query> [--files-only]"
+    exit 1
+fi
+
+if [ "$MODE" = "--files-only" ]; then
+    grep -rl --include="*.md" --include="*.yaml" "$QUERY" "$WIKI_DIR" 2>/dev/null | sort
+else
+    grep -rn --include="*.md" --include="*.yaml" --color=auto -i "$QUERY" "$WIKI_DIR" 2>/dev/null
+fi