feat(database): add performance indexes for optimized task queries

- Introduced a new SQL migration file to create various performance indexes on tasks, task_assignees, task_phase, and related tables.
- These indexes aim to enhance query performance for task filtering, status joins, assignees lookup, and other operations, improving overall application efficiency.

worklenz-backend/database/migrations/20250115000000-performance-indexes.sql

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+-- Performance indexes for optimized tasks queries
+-- Migration: 20250115000000-performance-indexes.sql
+
+-- Composite index for main task filtering
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tasks_project_archived_parent 
+ON tasks(project_id, archived, parent_task_id) 
+WHERE archived = FALSE;
+
+-- Index for status joins
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tasks_status_project 
+ON tasks(status_id, project_id) 
+WHERE archived = FALSE;
+
+-- Index for assignees lookup
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tasks_assignees_task_member 
+ON tasks_assignees(task_id, team_member_id);
+
+-- Index for phase lookup
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_phase_task_phase 
+ON task_phase(task_id, phase_id);
+
+-- Index for subtask counting
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tasks_parent_archived 
+ON tasks(parent_task_id, archived) 
+WHERE parent_task_id IS NOT NULL AND archived = FALSE;
+
+-- Index for labels
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_labels_task_label 
+ON task_labels(task_id, label_id);
+
+-- Index for comments count
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_comments_task 
+ON task_comments(task_id);
+
+-- Index for attachments count
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_attachments_task 
+ON task_attachments(task_id);
+
+-- Index for work log aggregation
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_work_log_task 
+ON task_work_log(task_id);
+
+-- Index for subscribers check
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_subscribers_task 
+ON task_subscribers(task_id);
+
+-- Index for dependencies check
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_dependencies_task 
+ON task_dependencies(task_id);
+
+-- Index for timers lookup
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_timers_task_user 
+ON task_timers(task_id, user_id);
+
+-- Index for custom columns
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_cc_column_values_task 
+ON cc_column_values(task_id);
+
+-- Index for team member info view optimization
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_team_members_team_user 
+ON team_members(team_id, user_id) 
+WHERE active = TRUE;
+
+-- Index for notification settings
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_notification_settings_user_team 
+ON notification_settings(user_id, team_id);
+
+-- Index for task status categories
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_statuses_category 
+ON task_statuses(category_id, project_id);
+
+-- Index for project phases
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_project_phases_project_sort 
+ON project_phases(project_id, sort_index);
+
+-- Index for task priorities
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_task_priorities_value 
+ON task_priorities(value);
+
+-- Index for team labels
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_team_labels_team 
+ON team_labels(team_id);