Store cookie durations as max_age_seconds

Replace the free-form duration TEXT column with a nullable
max_age_seconds INTEGER on both cookies and cookie_patterns
tables. The SDK detector now sends raw seconds instead of
humanized strings, eliminating locale-dependent comparisons
in the pattern merge worker. Humanization happens at display
time in the widget and console UI.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/server/api/cookiebanner/v1/handler.go

@@ -187,9 +187,9 @@ func (h *Handler) handlePostConsent(w http.ResponseWriter, r *http.Request) {
 }
 
 type detectedCookieEntry struct {
-	Name     string `json:"name"`
-	Duration string `json:"duration"`
-	Source   string `json:"source"`
+	Name          string `json:"name"`
+	MaxAgeSeconds *int   `json:"max_age_seconds"`
+	Source        string `json:"source"`
 }
 
 type reportDetectedCookiesBody struct {
@@ -239,9 +239,9 @@ func (h *Handler) handleReportDetectedCookies(w http.ResponseWriter, r *http.Req
 		detected = append(
 			detected,
 			cookiebanner.DetectedCookie{
-				Name:     name,
-				Duration: strings.TrimSpace(c.Duration),
-				Source:   source,
+				Name:          name,
+				MaxAgeSeconds: c.MaxAgeSeconds,
+				Source:        source,
 			},
 		)
 	}