Add customizable plugin display names and weights (#8459)

* feat: add customizable plugin display names and weights

- Add weight field to JobTypeCapability proto message
- Modify ListKnownJobTypes() to return JobTypeInfo with display names and weights
- Modify ListPluginJobTypes() to return JobTypeInfo instead of string
- Sort plugins by weight (descending) then alphabetically
- Update admin API to return enriched job type metadata
- Update plugin UI template to display names instead of IDs
- Consolidate API by reusing existing function names instead of suffixed variants

* perf: optimize plugin job type capability lookup and add null-safe parsing

- Pre-calculate job type capabilities in a map to reduce O(n*m) nested loops
  to O(n+m) lookup time in ListKnownJobTypes()
- Add parseJobTypeItem() helper function for null-safe job type item parsing
- Refactor plugin.templ to use parseJobTypeItem() in all job type access points
  (hasJobType, applyInitialNavigation, ensureActiveNavigation, renderTopTabs)
- Deterministic capability resolution by using first worker's capability

* templ

* refactor: use parseJobTypeItem helper consistently in plugin.templ

Replace duplicated job type extraction logic at line 1296-1298 with
parseJobTypeItem() helper function for consistency and maintainability.

* improve: prefer richer capability metadata and add null-safety checks

- Improve capability selection in ListKnownJobTypes() to prefer capabilities
  with non-empty DisplayName and higher Weight across all workers instead of
  first-wins approach. Handles mixed-version clusters better.
- Add defensive null checks in renderJobTypeSummary() to safely access
  parseJobTypeItem() result before property access
- Ensures malformed or missing entries won't break the rendering pipeline

* fix: preserve existing DisplayName when merging capabilities

Fix capability merge logic to respect existing DisplayName values:
- If existing has DisplayName but candidate doesn't, preserve existing
- If existing doesn't have DisplayName but candidate does, use candidate
- Only use Weight comparison if DisplayName status is equal
- Prevents higher-weight capabilities with empty DisplayName from
  overriding capabilities with non-empty DisplayName

weed/admin/plugin/plugin.go

@@ -34,6 +34,13 @@ type Options struct {
 	ClusterContextProvider func(context.Context) (*plugin_pb.ClusterContext, error)
 }
 
+// JobTypeInfo contains metadata about a plugin job type.
+type JobTypeInfo struct {
+	JobType     string `json:"job_type"`
+	DisplayName string `json:"display_name"`
+	Weight      int32  `json:"weight"`
+}
+
 type Plugin struct {
 	plugin_pb.UnimplementedPluginControlServiceServer
 
@@ -623,7 +630,7 @@ func (r *Plugin) ListWorkers() []*WorkerSession {
 	return r.registry.List()
 }
 
-func (r *Plugin) ListKnownJobTypes() ([]string, error) {
+func (r *Plugin) ListKnownJobTypes() ([]JobTypeInfo, error) {
 	registryJobTypes := r.registry.JobTypes()
 	storedJobTypes, err := r.store.ListJobTypes()
 	if err != nil {
@@ -638,12 +645,72 @@ func (r *Plugin) ListKnownJobTypes() ([]string, error) {
 		jobTypeSet[jobType] = struct{}{}
 	}
 
-	out := make([]string, 0, len(jobTypeSet))
+	jobTypeList := make([]string, 0, len(jobTypeSet))
 	for jobType := range jobTypeSet {
-		out = append(out, jobType)
+		jobTypeList = append(jobTypeList, jobType)
 	}
-	sort.Strings(out)
-	return out, nil
+	sort.Strings(jobTypeList)
+
+	result := make([]JobTypeInfo, 0, len(jobTypeList))
+	workers := r.registry.List()
+
+	// Pre-calculate the best capability for each job type from available workers.
+	// Prefer capabilities with non-empty DisplayName, then higher Weight.
+	jobTypeToCap := make(map[string]*plugin_pb.JobTypeCapability)
+	for _, worker := range workers {
+		for jobType, cap := range worker.Capabilities {
+			if cap == nil {
+				continue
+			}
+			existing, exists := jobTypeToCap[jobType]
+			if !exists || existing == nil {
+				jobTypeToCap[jobType] = cap
+				continue
+			}
+			// Preserve existing if it has DisplayName but cap doesn't.
+			if existing.DisplayName != "" && cap.DisplayName == "" {
+				continue
+			}
+			// Prefer capabilities with a non-empty DisplayName.
+			if existing.DisplayName == "" && cap.DisplayName != "" {
+				jobTypeToCap[jobType] = cap
+				continue
+			}
+			// If DisplayName statuses are equal, prefer higher Weight.
+			if cap.Weight > existing.Weight {
+				jobTypeToCap[jobType] = cap
+			}
+		}
+	}
+
+	for _, jobType := range jobTypeList {
+		info := JobTypeInfo{JobType: jobType}
+
+		// Get display name and weight from pre-calculated capabilities
+		if cap, ok := jobTypeToCap[jobType]; ok && cap != nil {
+			if cap.DisplayName != "" {
+				info.DisplayName = cap.DisplayName
+			}
+			info.Weight = cap.Weight
+		}
+
+		// Default display name to job type if not set
+		if info.DisplayName == "" {
+			info.DisplayName = jobType
+		}
+
+		result = append(result, info)
+	}
+
+	// Sort by weight (descending) then by job type (ascending)
+	sort.Slice(result, func(i, j int) bool {
+		if result[i].Weight != result[j].Weight {
+			return result[i].Weight > result[j].Weight // higher weight first
+		}
+		return result[i].JobType < result[j].JobType // alphabetical as tiebreaker
+	})
+
+	return result, nil
 }
 
 // FilterProposalsWithActiveJobs drops proposals that are already assigned/running.