docs: Fix Phase 1 job type duplication with Phase 0.5

Fixed issue where Phase 1 tried to add job types that were already added in Phase 0.5.

Changes:
1. Step 1.1 - Updated title from 'Add All Job Type Constants' to 'Add NEW Job Type Constants'
   - Now shows current state after Phase 0.5 (JobTypeScan, JobTypeSetFolders, JobTypeDirectoryScan)
   - Only adds NEW Phase 1 job types: Import, Convert, Thumbnails, Reindex, Backup, Analytics, Sync
   - Clarifies that JobTypeScan, JobTypeSetFolders, JobTypeDirectoryScan were added in Phase 0.5

2. Step 1.2 - Updated title from 'Add Job Handlers to Switch Statement' to 'Add NEW Job Handlers to Switch Statement'
   - Now shows current state after Phase 0.5 (handlers for Scan, SetFolders, DirectoryScan)
   - Only adds NEW Phase 1 handlers for the new job types
   - Clarifies that existing handlers were added in Phase 0.5

Impact: Developers now have clear guidance on which job types/handlers to add in each phase, avoiding confusion and potential merge conflicts.

COMPLETE_INFRASTRUCTURE_ENHANCEMENT_PLAN.md

@@ -1289,60 +1289,72 @@ Files modified:
 
 ## Phase 1: Job Queue Expansion (6-8 hours)
 
-### Step 1.1: Add All Job Type Constants
+### Step 1.1: Add NEW Job Type Constants
 **File**: `internal/services/worker.go`
 
 **Location**: JobType constants (lines 24-28)
 
-**Current code**:
+**Current code** (after Phase 0.5):
 ```go
 const (
     JobTypeScan          JobType = "scan"
+    JobTypeSetFolders    JobType = "set_folders"
+    JobTypeDirectoryScan JobType = "directory_scan"
 )
 ```
 
-**Action**: Add all new job types:
+**Action**: Add NEW job types for Phase 1:
 
 ```go
 const (
     JobTypeScan          JobType = "scan"
-    JobTypeImport     JobType = "import"          // NEW
+    JobTypeSetFolders    JobType = "set_folders"
-    JobTypeConvert    JobType = "convert"         // NEW
+    JobTypeDirectoryScan JobType = "directory_scan"
-    JobTypeThumbnails JobType = "thumbnails"      // NEW
+    JobTypeImport        JobType = "import"        // NEW - Phase 1
-    JobTypeReindex    JobType = "reindex"         // NEW
+    JobTypeConvert       JobType = "convert"       // NEW - Phase 1
-    JobTypeBackup     JobType = "backup"          // NEW
+    JobTypeThumbnails    JobType = "thumbnails"    // NEW - Phase 1
-    JobTypeAnalytics  JobType = "analytics"       // NEW
+    JobTypeReindex       JobType = "reindex"       // NEW - Phase 1
-    JobTypeSync       JobType = "sync"            // NEW
+    JobTypeBackup        JobType = "backup"        // NEW - Phase 1
+    JobTypeAnalytics     JobType = "analytics"     // NEW - Phase 1
+    JobTypeSync          JobType = "sync"          // NEW - Phase 1
 )
 ```
 
-**Why**: Defines all job types the system will support. Job queue is massively underutilized (only 1 type).
+**Why**: Phase 0.5 added JobTypeScan, JobTypeSetFolders, and JobTypeDirectoryScan. Phase 1 expands the job queue to support more async operations: import, conversion, thumbnails, reindexing, backup, analytics, and sync.
 
 **Verification**: Run `go build ./internal/services/` to ensure compiles.
 
 ---
 
-### Step 1.2: Add Job Handlers to Switch Statement
+### Step 1.2: Add NEW Job Handlers to Switch Statement
 **File**: `internal/services/worker.go`
 
 **Location**: `processJob()` function (around line 127-132)
 
-**Current code**:
+**Current code** (after Phase 0.5):
 ```go
 switch job.Type {
 case JobTypeScan:
     result, err = w.processScanJob(job)
+case JobTypeSetFolders:
+    result, err = w.processSetFoldersJob(job)
+case JobTypeDirectoryScan:
+    result, err = w.processDirectoryScanJob(job)
 default:
     err = fmt.Errorf("unknown job type: %s", job.Type)
 }
 ```
 
-**Action**: Add all new handlers:
+**Action**: Add NEW handlers for Phase 1 job types:
 
 ```go
 switch job.Type {
 case JobTypeScan:
     result, err = w.processScanJob(job)
+case JobTypeSetFolders:
+    result, err = w.processSetFoldersJob(job)
+case JobTypeDirectoryScan:
+    result, err = w.processDirectoryScanJob(job)
 case JobTypeImport:
     result, err = w.processImportJob(job)
 case JobTypeConvert:
@@ -1362,7 +1374,7 @@ default:
 }
 ```
 
-**Why**: Routes each job type to its handler function.
+**Why**: Phase 0.5 added handlers for JobTypeScan, JobTypeSetFolders, and JobTypeDirectoryScan. Phase 1 adds handlers for the new job types: import, conversion, thumbnails, reindexing, backup, analytics, and sync.
 
 **Verification**: Run `go build ./internal/services/` to ensure compiles (will fail until handlers are implemented).