feat: externalize apps/analysis to Gitea repos, add analysis table

- Migration 007: repo_url on apps table + analysis table with FTS5
- Analysis struct, parser, CRUD, validation, hash computation
- Selective purge: remote-only apps/analysis preserved across fn index
- CLI: fn app list/clone/pull, fn analysis list/clone/pull
- search/show/list now include analysis results
- Apps removed from git tracking (content lives in Gitea repos)
- .gitkeep for apps/ and analysis/ dirs
- Bash functions: jupyter analysis pipeline, shell utilities
- Browser domain: CDP functions moved from infra to browser

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

functions/browser/cdp_screenshot.go

@@ -0,0 +1,77 @@
+package browser
+
+import (
+	"encoding/base64"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// CdpScreenshotOpts configura el screenshot.
+type CdpScreenshotOpts struct {
+	// FullPage indica si capturar la pagina completa (scroll height) o solo el viewport.
+	FullPage bool
+	// Quality es la calidad JPEG (0-100). Solo aplica si Format es "jpeg". Por defecto 80.
+	Quality int
+	// Format es el formato de imagen: "png" o "jpeg". Por defecto "png".
+	Format string
+}
+
+// CdpScreenshot captura un screenshot de la pagina actual y lo guarda en outputPath.
+// Usa Page.captureScreenshot del protocolo CDP.
+// outputPath debe tener extension .png o .jpg/.jpeg segun el formato elegido.
+func CdpScreenshot(c *CDPConn, outputPath string, opts CdpScreenshotOpts) error {
+	if c == nil {
+		return fmt.Errorf("cdp screenshot: conexion nula")
+	}
+
+	if opts.Format == "" {
+		opts.Format = "png"
+	}
+	if opts.Quality == 0 && opts.Format == "jpeg" {
+		opts.Quality = 80
+	}
+
+	params := map[string]any{
+		"format":  opts.Format,
+		"captureBeyondViewport": opts.FullPage,
+	}
+	if opts.Format == "jpeg" {
+		params["quality"] = opts.Quality
+	}
+
+	if opts.FullPage {
+		// Expandir clip para capturar toda la pagina
+		scrollHeight, err := CdpEvaluate(c, "document.documentElement.scrollHeight")
+		if err == nil {
+			params["clip"] = nil // dejar que Chrome capture todo
+			_ = scrollHeight
+		}
+	}
+
+	result, err := c.sendCDP("Page.captureScreenshot", params)
+	if err != nil {
+		return fmt.Errorf("cdp screenshot: %w", err)
+	}
+
+	dataStr, ok := result["data"].(string)
+	if !ok {
+		return fmt.Errorf("cdp screenshot: campo data ausente en respuesta")
+	}
+
+	imgData, err := base64.StdEncoding.DecodeString(dataStr)
+	if err != nil {
+		return fmt.Errorf("cdp screenshot: decodificar base64: %w", err)
+	}
+
+	// Crear directorio si no existe
+	if err := os.MkdirAll(filepath.Dir(outputPath), 0755); err != nil {
+		return fmt.Errorf("cdp screenshot: crear directorio: %w", err)
+	}
+
+	if err := os.WriteFile(outputPath, imgData, 0644); err != nil {
+		return fmt.Errorf("cdp screenshot: guardar archivo: %w", err)
+	}
+
+	return nil
+}