Add route diagram page with execution overlay and group-aware APIs

Backend: Add group filtering to agent list, search, stats, and timeseries
endpoints. Add diagram lookup by group+routeId. Resolve application group
to agent IDs server-side for ClickHouse IN-clause queries.

Frontend: New route detail page at /apps/{group}/routes/{routeId} with
three tabs (Diagram, Performance, Processor Tree). SVG diagram rendering
with panzoom, execution overlay (glow effects, duration/sequence badges,
flow particles, minimap), and processor detail panel. uPlot charts for
performance tab replacing old SVG sparklines. Ctrl+Click from
ExecutionExplorer navigates to route diagram with overlay.

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

ui/src/api/schema.d.ts

@@ -394,6 +394,26 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/diagrams": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * Find diagram by application group and route ID
+         * @description Resolves group to agent IDs and finds the latest diagram for the route
+         */
+        get: operations["findByGroupAndRoute"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/diagrams/{contentHash}/render": {
         parameters: {
             query?: never;
@@ -440,7 +460,7 @@ export interface paths {
         };
         /**
          * List all agents
-         * @description Returns all registered agents, optionally filtered by status
+         * @description Returns all registered agents, optionally filtered by status and/or group
          */
         get: operations["listAgents"];
         put?: never;
@@ -558,6 +578,8 @@ export interface components {
             routeId?: string;
             agentId?: string;
             processorType?: string;
+            group?: string;
+            agentIds?: string[];
             /** Format: int32 */
             offset?: number;
             /** Format: int32 */
@@ -759,6 +781,7 @@ export interface components {
             width?: number;
             /** Format: double */
             height?: number;
+            children?: components["schemas"]["PositionedNode"][];
         };
         /** @description OIDC configuration for SPA login flow */
         OidcPublicConfigResponse: {
@@ -915,6 +938,7 @@ export interface operations {
                 routeId?: string;
                 agentId?: string;
                 processorType?: string;
+                group?: string;
                 offset?: number;
                 limit?: number;
                 sortField?: string;
@@ -1452,6 +1476,8 @@ export interface operations {
             query: {
                 from: string;
                 to?: string;
+                routeId?: string;
+                group?: string;
             };
             header?: never;
             path?: never;
@@ -1476,6 +1502,8 @@ export interface operations {
                 from: string;
                 to?: string;
                 buckets?: number;
+                routeId?: string;
+                group?: string;
             };
             header?: never;
             path?: never;
@@ -1561,6 +1589,36 @@ export interface operations {
             };
         };
     };
+    findByGroupAndRoute: {
+        parameters: {
+            query: {
+                group: string;
+                routeId: string;
+            };
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Diagram layout returned */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "*/*": components["schemas"]["DiagramLayout"];
+                };
+            };
+            /** @description No diagram found for the given group and route */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content?: never;
+            };
+        };
+    };
     renderDiagram: {
         parameters: {
             query?: never;
@@ -1635,6 +1693,7 @@ export interface operations {
         parameters: {
             query?: {
                 status?: string;
+                group?: string;
             };
             header?: never;
             path?: never;