feat[BE]: enhance expense management with location and project flock integration, including updates to migrations, entities, services, and validations

internal/database/migrations/20251227100000_update_expense_table.up.sql

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+-- Migration: Update expense and expense_nonstocks tables
+
+-- Add location_id column to expenses table
+ALTER TABLE expenses
+ADD COLUMN IF NOT EXISTS location_id BIGINT NOT NULL DEFAULT 1;
+
+-- Add project_flock_id column to expenses table (JSON type)
+ALTER TABLE expenses
+ADD COLUMN IF NOT EXISTS project_flock_id JSON NULL;
+
+-- Add Foreign Key constraint to locations table
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM pg_tables WHERE tablename = 'locations') THEN
+        ALTER TABLE expenses
+            ADD CONSTRAINT fk_expenses_location_id
+            FOREIGN KEY (location_id) REFERENCES locations(id) ON DELETE RESTRICT ON UPDATE CASCADE;
+    END IF;
+END $$;
+
+-- Create index for location_id
+CREATE INDEX IF NOT EXISTS idx_expenses_location_id ON expenses (location_id);
+
+-- Create index for project_flock_id
+CREATE INDEX IF NOT EXISTS idx_expenses_project_flock_id ON expenses ((project_flock_id::text));
+
+-- Ensure kandang_id is nullable in expense_nonstocks table
+ALTER TABLE expense_nonstocks
+ALTER COLUMN kandang_id DROP NOT NULL;