feat: Regulatory News Dashboard — proaktive Compliance-Alerts

Zeigt anstehende regulatorische Fristen im Dashboard an, abgeleitet
aus den bestehenden Obligation v2 JSON-Dateien. Keine neue DB-Tabelle.

Erster News-Eintrag: Widerrufsbutton-Pflicht ab 19.06.2026
(EU-RL 2023/2673, §356a BGB) — eigener Text, keine externe Quelle.

Features:
- Go Service: scannt Obligations nach Fristen, berechnet Urgency
- API: GET /sdk/v1/regulatory-news mit Countdown + Farbcodierung
- Dashboard: RegulatoryNewsFeed Sektion mit Countdown-Badges
- Vorlage: news-Feld in v2 JSON fuer zukuenftige regulatorische Updates
- 11 Tests (Sortierung, Urgency, Deadline-Parsing, Real-File-Test)

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

ai-compliance-sdk/internal/api/handlers/regulatory_news_handlers.go

@@ -0,0 +1,42 @@
+package handlers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/breakpilot/ai-compliance-sdk/internal/ucca"
+	"github.com/gin-gonic/gin"
+)
+
+// RegulatoryNewsHandlers serves regulatory news from obligation v2 data.
+type RegulatoryNewsHandlers struct {
+	regulations map[string]*ucca.V2RegulationFile
+}
+
+// NewRegulatoryNewsHandlers creates a handler backed by pre-loaded regulation data.
+func NewRegulatoryNewsHandlers(regs map[string]*ucca.V2RegulationFile) *RegulatoryNewsHandlers {
+	return &RegulatoryNewsHandlers{regulations: regs}
+}
+
+// GetNews returns upcoming regulatory deadlines sorted by urgency.
+func (h *RegulatoryNewsHandlers) GetNews(c *gin.Context) {
+	filter := ucca.RegulatoryNewsFilter{
+		BusinessModel: c.Query("business_model"),
+		HorizonDays:   parseIntOrDefault(c.Query("horizon_days"), 365),
+		Limit:         parseIntOrDefault(c.Query("limit"), 5),
+	}
+
+	items := ucca.GetRegulatoryNews(h.regulations, filter)
+	c.JSON(http.StatusOK, gin.H{"items": items, "total": len(items)})
+}
+
+func parseIntOrDefault(s string, def int) int {
+	if s == "" {
+		return def
+	}
+	v, err := strconv.Atoi(s)
+	if err != nil {
+		return def
+	}
+	return v
+}