Optimize shot table loading performance

- Pass episode_id filter to backend API instead of client-side filtering,
  reducing payload size when an episode is selected
- Skip getShot refetch in ShotDetailPanel when initialShot prop is provided
- Fix redundant DB query in list_shots: read project.custom_task_statuses
  directly from the already-fetched project object
- Add missing indexes on Task.shot_id, Task.assigned_user_id,
  Task.deleted_at and Episode.project_id; add add_perf_indexes.py
  migration script to apply them to existing databases
- Center login page layout
- Update CLAUDE.md and AGENTS.md with correct venv path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/services/breadcrumb.ts

@@ -1,6 +1,7 @@
 import type { RouteLocationNormalized } from 'vue-router'
 import { useProjectsStore } from '@/stores/projects'
 import { episodeService } from '@/services/episode'
+import { shotService } from '@/services/shot'
 
 export interface BreadcrumbItem {
   label: string
@@ -73,6 +74,30 @@ export class BreadcrumbService {
             })
           }
         }
+        
+        // Handle shot detail page (path: /projects/:projectId/shots/:shotId)
+        if (pathSegments[2] === 'shots' && pathSegments[3]) {
+          const shotId = parseInt(pathSegments[3])
+          if (!isNaN(shotId)) {
+            try {
+              const shot = await shotService.getShot(shotId)
+              // Replace the last item (Shots) with Shots > ShotName
+              if (crumbs.length > 1) {
+                crumbs[crumbs.length - 1] = {
+                  label: 'Shots',
+                  href: `/projects/${projectId}/shots`
+                }
+              }
+              crumbs.push({
+                label: shot.name,
+                isActive: true
+              })
+            } catch (error) {
+              console.error('Failed to load shot for breadcrumbs:', error)
+              // Keep the default behavior - show shot ID
+            }
+          }
+        }
       }
     } else {
       // Handle other routes