Add expenses module, update dashboard financials, and enhance reservation payment management

supabase_schema_expenses.sql

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+-- Create Expense Categories Table
+create table expense_categories (
+  id uuid default uuid_generate_v4() primary key,
+  name text not null,
+  description text,
+  created_at timestamp with time zone default timezone('utc'::text, now()) not null
+);
+
+-- Create Expenses Table
+create table expenses (
+  id uuid default uuid_generate_v4() primary key,
+  category_id uuid references expense_categories(id) on delete set null,
+  amount decimal(10,2) not null,
+  description text,
+  date timestamp with time zone default timezone('utc'::text, now()) not null,
+  created_by uuid references auth.users(id),
+  created_at timestamp with time zone default timezone('utc'::text, now()) not null
+);
+
+-- RLS
+alter table expense_categories enable row level security;
+alter table expenses enable row level security;
+
+create policy "Enable all access for authenticated users" on expense_categories for all using (auth.role() = 'authenticated');
+create policy "Enable all access for authenticated users" on expenses for all using (auth.role() = 'authenticated');