projects: add /all endpoint for unlimited project list

Solve pagination issue where configs reference projects not in the
paginated list (default 10 items, but there could be 50+ projects).

Changes:
- Add GET /api/projects/all endpoint that returns ALL projects without
  pagination as simple {uuid, name} objects
- Update frontend loadProjectsForConfigUI() to use /api/projects/all
  instead of /api/projects?status=all
- Ensures all projects are available in projectNameByUUID for config
  display, regardless of total project count

This fixes cases where project names don't display in /configs page
for configs that reference projects outside the paginated range.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

web/templates/configs.html

@@ -835,12 +835,17 @@ async function loadProjectsForConfigUI() {
     projectsCache = [];
     projectNameByUUID = {};
     try {
-        const resp = await fetch('/api/projects?status=all');
+        // Use /api/projects/all to get all projects without pagination
+        const resp = await fetch('/api/projects/all');
         if (!resp.ok) return;
         const data = await resp.json();
-        projectsCache = (data.projects || []);
+        // data is now a simple array of {uuid, name} objects
+        const allProjects = Array.isArray(data) ? data : (data.projects || []);
 
-        projectsCache.forEach(project => {
+        // For compatibility with rest of code, populate projectsCache but mainly use projectNameByUUID
+        projectsCache = allProjects;
+
+        allProjects.forEach(project => {
             projectNameByUUID[project.uuid] = project.name;
         });