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.md

@@ -0,0 +1,37 @@
+---
+name: cdp_screenshot
+kind: function
+lang: go
+domain: browser
+version: "1.0.0"
+purity: impure
+signature: "func CdpScreenshot(c *CDPConn, outputPath string, opts CdpScreenshotOpts) error"
+description: "Captura un screenshot de la pagina actual via Page.captureScreenshot y lo guarda en el archivo indicado. Soporta PNG y JPEG, viewport o pagina completa. Crea el directorio destino si no existe."
+tags: [chrome, cdp, browser, automation, screenshot, devtools, png]
+uses_functions: [cdp_connect_go_browser, cdp_evaluate_go_browser]
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: [encoding/base64, fmt, os, path/filepath]
+tested: true
+tests: ["TestCdpScreenshot"]
+test_file_path: "functions/infra/chrome_launch_test.go"
+file_path: "functions/infra/cdp_screenshot.go"
+---
+
+## Ejemplo
+
+```go
+conn, _ := CdpConnect(9222)
+CdpNavigate(conn, "https://example.com")
+
+err := CdpScreenshot(conn, "/tmp/page.png", CdpScreenshotOpts{
+    FullPage: true,
+    Format:   "png",
+})
+```
+
+## Notas
+
+El struct `CdpScreenshotOpts` tiene campos: `FullPage bool`, `Quality int` (JPEG), `Format string` ("png" o "jpeg"). Chrome retorna la imagen como base64 que se decodifica y escribe al disco.