feat: Add dedicated dashboard methods to service clients

Created typed, domain-specific methods in service clients instead of
using generic .get() calls with paths. This improves type safety,
discoverability, and maintainability.

Service Client Changes:
- ProcurementServiceClient:
  * get_pending_purchase_orders() - POs awaiting approval
  * get_critical_alerts() - Critical severity alerts
  * get_alerts_summary() - Alert counts by severity

- ProductionServiceClient:
  * get_todays_batches() - Today's production timeline
  * get_production_batches_by_status() - Filter by status

- InventoryServiceClient:
  * get_stock_status() - Dashboard stock metrics
  * get_sustainability_widget() - Sustainability data

Dashboard API Changes:
- Updated all endpoints to use new dedicated methods
- Cleaner, more maintainable code
- Better error handling and logging
- Fixed inventory data type handling (list vs dict)

Note: Alert endpoints return 404 - alert_processor service needs
endpoints: /alerts/summary and /alerts (filtered by severity).

shared/clients/inventory_client.py

@@ -651,6 +651,54 @@ class InventoryServiceClient(BaseServiceClient):
                        error=str(e), tenant_id=tenant_id)
             return None
 
+    # ================================================================
+    # DASHBOARD METHODS
+    # ================================================================
+
+    async def get_stock_status(
+        self,
+        tenant_id: str
+    ) -> Optional[Dict[str, Any]]:
+        """
+        Get inventory stock status for dashboard insights
+
+        Args:
+            tenant_id: Tenant ID
+
+        Returns:
+            Dict with stock counts and status metrics
+        """
+        try:
+            return await self.get(
+                "/inventory/dashboard/stock-status",
+                tenant_id=tenant_id
+            )
+        except Exception as e:
+            logger.error("Error fetching stock status", error=str(e), tenant_id=tenant_id)
+            return None
+
+    async def get_sustainability_widget(
+        self,
+        tenant_id: str
+    ) -> Optional[Dict[str, Any]]:
+        """
+        Get sustainability metrics for dashboard
+
+        Args:
+            tenant_id: Tenant ID
+
+        Returns:
+            Dict with sustainability metrics (waste, CO2, etc.)
+        """
+        try:
+            return await self.get(
+                "/inventory/sustainability/widget",
+                tenant_id=tenant_id
+            )
+        except Exception as e:
+            logger.error("Error fetching sustainability widget", error=str(e), tenant_id=tenant_id)
+            return None
+
     # ================================================================
     # UTILITY METHODS
     # ================================================================