Initial commit: Phase 1+2 prototype

- Go backend with SQLite, JWT auth, file CRUD
- Vue 3 frontend with split/raw/WYSIWYG editor modes
- Markdown preview (marked, GFM)
- Formatting toolbar + keyboard shortcuts
- File tree with search, create, delete
- Light/dark theme toggle
- Admin panel (user management)
- Preferences (timezone, theme, default mode)
- Shared documents section (placeholder)
- Export: PDF, HTML, MD
- Build daemon (Python, stdlib only)
- Build job queue API
- Docker deployment

internal/files/search.go

@@ -0,0 +1,66 @@
+package files
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type SearchResult struct {
+	Path    string `json:"path"`
+	Snippet string `json:"snippet"`
+}
+
+// Search finds files containing the query string (case-insensitive).
+func Search(dataDir, userID, query string) ([]SearchResult, error) {
+	root := UserDir(dataDir, userID)
+	query = strings.ToLower(query)
+	var results []SearchResult
+
+	filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil || info.IsDir() {
+			return nil
+		}
+		rel, _ := filepath.Rel(root, path)
+
+		// Match filename
+		if strings.Contains(strings.ToLower(info.Name()), query) {
+			results = append(results, SearchResult{Path: rel, Snippet: "(filename match)"})
+			return nil
+		}
+
+		// Match content (only for .md and .txt)
+		ext := strings.ToLower(filepath.Ext(path))
+		if ext == ".md" || ext == ".txt" {
+			content, err := os.ReadFile(path)
+			if err != nil {
+				return nil
+			}
+			lower := strings.ToLower(string(content))
+			idx := strings.Index(lower, query)
+			if idx >= 0 {
+				// Extract snippet
+				start := idx - 40
+				if start < 0 {
+					start = 0
+				}
+				end := idx + len(query) + 40
+				if end > len(content) {
+					end = len(content)
+				}
+				snippet := string(content[start:end])
+				results = append(results, SearchResult{Path: rel, Snippet: snippet})
+			}
+		}
+
+		if len(results) >= 50 {
+			return filepath.SkipAll
+		}
+		return nil
+	})
+
+	if results == nil {
+		results = []SearchResult{}
+	}
+	return results, nil
+}