Fix {{DEPARTMENT}} and {{DOCTOR_NAMES}} placeholder tokens

Problem:
- {{DEPARTMENT}} and {{DOCTOR_NAMES}} placeholders not working in discharge templates
- Complex GROUP_CONCAT query with LEFT JOINs causing issues
- Query might return NULL or fail silently when specializations missing

Solution - getDischargeDoctorNames():
- Removed GROUP_CONCAT to avoid SQL aggregation issues
- Split into two separate queries: doctors first, then specializations
- Changed specialization JOIN from LEFT to INNER to avoid NULL values
- Query doctors from doctor_master separately
- For each doctor, query doc_spec + med_spec to get specializations
- Build full name format: 'Dr. Name [Spec1, Spec2]' or 'Title Name [Spec1, Spec2]'
- Return comma-separated list of all doctors

Technical Changes:
- First query: SELECT d.id, d.p_fname, d.p_title FROM doctor_master
- Second query (per doctor): SELECT m.SpecName FROM doc_spec s JOIN med_spec m
- Use INNER JOIN for specializations to only include valid matches
- Handle missing specializations gracefully (show doctor name without brackets)
- Handle missing title (default to 'Dr.')

getDischargeDepartmentName() - Already Working:
- Tries dept_id from ipd_master
- Queries hc_department table first
- Falls back to ipd_department table
- Falls back to direct department field
- Returns empty string if all methods fail

Token Flow:
1. buildDischargeSummaryTokenVars() calls both functions
2. Returns array with 'DEPARTMENT' and 'DOCTOR_NAMES' keys
3. buildDischargeTemplateTokenVars() merges these tokens
4. Creates lowercase, UPPERCASE, and Ucfirst versions of all tokens
5. applyDischargeTemplateTokens() replaces {{TOKEN}} and {TOKEN} in template

Available Token Variants:
- {{DEPARTMENT}}, {{department}}, {{Department}}
- {{DOCTOR_NAMES}}, {{doctor_names}}, {{Doctor_names}}
- {{DOCTOR_NAME}} (singular alias for same value)

Example Output:
- Single doctor: 'Dr. John Smith [Cardiology]'
- Multiple doctors: 'Dr. John Smith [Cardiology], Dr. Jane Doe [Neurology]'
- No specialization: 'Dr. John Smith'
- With title: 'Prof. John Smith [Cardiology]'

Testing:
- Ensure doc_list field in ipd_master has comma-separated doctor IDs
- Falls back to doctor_id, doc_id, or consultant_id if doc_list empty
- Returns empty string if no valid doctor IDs found

app/Controllers/Ipd_discharge.php

@@ -964,12 +964,10 @@ class Ipd_discharge extends BaseController
             return '';
         }
 
+        // Simplified query to avoid GROUP_CONCAT issues
         $doctors = $this->db->table('doctor_master d')
-            ->select("d.id, d.p_fname, d.p_title, group_concat(distinct m.SpecName SEPARATOR ', ') as SpecName", false)
-            ->join('doc_spec s', 'd.id = s.doc_id', 'left')
-            ->join('med_spec m', 's.med_spec_id = m.id', 'left')
+            ->select('d.id, d.p_fname, d.p_title')
             ->whereIn('d.id', $docIds)
-            ->groupBy('d.id')
             ->get()
             ->getResult();
 
@@ -979,17 +977,35 @@ class Ipd_discharge extends BaseController
 
         $names = [];
         foreach ($doctors as $doc) {
+            $docId = (int) ($doc->id ?? 0);
             $title = trim((string) ($doc->p_title ?? ''));
             $name = trim((string) ($doc->p_fname ?? ''));
-            $spec = trim((string) ($doc->SpecName ?? ''));
 
             if ($name === '') {
                 continue;
             }
 
+            // Get specializations separately
+            $specs = [];
+            if ($this->db->tableExists('doc_spec') && $this->db->tableExists('med_spec')) {
+                $specRows = $this->db->table('doc_spec s')
+                    ->select('m.SpecName')
+                    ->join('med_spec m', 's.med_spec_id = m.id', 'inner')
+                    ->where('s.doc_id', $docId)
+                    ->get()
+                    ->getResult();
+
+                foreach ($specRows as $specRow) {
+                    $specName = trim((string) ($specRow->SpecName ?? ''));
+                    if ($specName !== '') {
+                        $specs[] = $specName;
+                    }
+                }
+            }
+
             $fullName = ($title !== '' ? $title . ' ' : 'Dr. ') . $name;
-            if ($spec !== '') {
-                $fullName .= ' [' . $spec . ']';
+            if (! empty($specs)) {
+                $fullName .= ' [' . implode(', ', $specs) . ']';
             }
             $names[] = $fullName;
         }