Consolidated round management, AI filtering enhancements, MinIO storage restructure

- Fix STAGE_ACTIVE bug in assignment router (now ROUND_ACTIVE)
- Add evaluation form CRUD (getForm + upsertForm endpoints)
- Add advanceProjects mutation for manual project advancement
- Rewrite round detail page: 7-tab consolidated interface
- Add filtering rules UI with full CRUD (field-based, document check, AI screening)
- Add pageCount field to ProjectFile for document page limit filtering
- Enhance AI filtering: per-file page limits, category/region-aware guidelines
- Restructure MinIO paths: {ProjectName}/{RoundName}/{timestamp}-{file}
- Update dashboard and pool page links from /admin/competitions to /admin/rounds

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

src/lib/minio.ts

@@ -119,14 +119,39 @@ export async function deleteObject(
 }
 
 /**
- * Generate a unique object key for a project file
+ * Sanitize a name for use as a MinIO path segment.
+ * Removes special characters, replaces spaces with underscores, limits length.
  */
-export function generateObjectKey(
-  projectId: string,
-  fileName: string
-): string {
-  const timestamp = Date.now()
-  const sanitizedName = fileName.replace(/[^a-zA-Z0-9.-]/g, '_')
-  return `projects/${projectId}/${timestamp}-${sanitizedName}`
+function sanitizePath(name: string): string {
+  return (
+    name
+      .trim()
+      .replace(/[^a-zA-Z0-9\-_ ]/g, '')
+      .replace(/\s+/g, '_')
+      .substring(0, 100) || 'unnamed'
+  )
+}
+
+/**
+ * Generate a unique object key for a project file.
+ *
+ * Structure: {ProjectName}/{RoundName}/{timestamp}-{fileName}
+ * - projectName: human-readable project title (sanitized)
+ * - roundName: round name for submission context (sanitized), defaults to "general"
+ * - fileName: original file name (sanitized)
+ *
+ * Existing files with old-style keys (projects/{id}/...) are unaffected
+ * because retrieval uses the objectKey stored in the database.
+ */
+export function generateObjectKey(
+  projectName: string,
+  fileName: string,
+  roundName?: string
+): string {
+  const timestamp = Date.now()
+  const sanitizedProject = sanitizePath(projectName)
+  const sanitizedRound = roundName ? sanitizePath(roundName) : 'general'
+  const sanitizedFile = fileName.replace(/[^a-zA-Z0-9.-]/g, '_')
+  return `${sanitizedProject}/${sanitizedRound}/${timestamp}-${sanitizedFile}`
 }