feat: add Future Year Budget Planning with inflation-adjusted projections

Adds budget planning capability under Board Planning, allowing HOA boards
to model future year budgets with configurable per-year inflation rates.

Backend:
- New budget_plans + budget_plan_lines tables (migration 014)
- BudgetPlanningService: CRUD, inflation generation (per-month preservation),
  status workflow (planning → approved → ratified), ratify-to-official copy
- 8 new API endpoints on board-planning controller
- Projection engine (both board-planning and reports) now falls back to
  planned budgets via UNION ALL query when no official budget exists
- Extended year range from 3 to dynamic based on projection months

Frontend:
- BudgetPlanningPage with monthly grid table (mirrors BudgetsPage pattern)
- Year selector, inflation rate control, status progression buttons
- Inline editing with save, confirmation modals for status changes
- Manual edit tracking with visual indicator
- Summary cards for income/expense totals

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

db/migrations/014-budget-planning.sql

@@ -0,0 +1,54 @@
+-- Migration: Add budget_plans and budget_plan_lines tables to all tenant schemas
+DO $migration$
+DECLARE
+  s TEXT;
+BEGIN
+  FOR s IN
+    SELECT schema_name FROM information_schema.schemata WHERE schema_name LIKE 'tenant_%'
+  LOOP
+    -- budget_plans
+    EXECUTE format('
+      CREATE TABLE IF NOT EXISTS %I.budget_plans (
+        id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+        fiscal_year INTEGER NOT NULL,
+        status VARCHAR(20) NOT NULL DEFAULT ''planning'' CHECK (status IN (''planning'', ''approved'', ''ratified'')),
+        base_year INTEGER NOT NULL,
+        inflation_rate DECIMAL(5,2) NOT NULL DEFAULT 2.50,
+        notes TEXT,
+        created_by UUID,
+        approved_by UUID,
+        approved_at TIMESTAMPTZ,
+        ratified_by UUID,
+        ratified_at TIMESTAMPTZ,
+        created_at TIMESTAMPTZ DEFAULT NOW(),
+        updated_at TIMESTAMPTZ DEFAULT NOW(),
+        UNIQUE(fiscal_year)
+      )', s);
+
+    -- budget_plan_lines
+    EXECUTE format('
+      CREATE TABLE IF NOT EXISTS %I.budget_plan_lines (
+        id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+        budget_plan_id UUID NOT NULL REFERENCES %I.budget_plans(id) ON DELETE CASCADE,
+        account_id UUID NOT NULL REFERENCES %I.accounts(id),
+        fund_type VARCHAR(20) NOT NULL CHECK (fund_type IN (''operating'', ''reserve'')),
+        jan DECIMAL(12,2) DEFAULT 0, feb DECIMAL(12,2) DEFAULT 0,
+        mar DECIMAL(12,2) DEFAULT 0, apr DECIMAL(12,2) DEFAULT 0,
+        may DECIMAL(12,2) DEFAULT 0, jun DECIMAL(12,2) DEFAULT 0,
+        jul DECIMAL(12,2) DEFAULT 0, aug DECIMAL(12,2) DEFAULT 0,
+        sep DECIMAL(12,2) DEFAULT 0, oct DECIMAL(12,2) DEFAULT 0,
+        nov DECIMAL(12,2) DEFAULT 0, dec_amt DECIMAL(12,2) DEFAULT 0,
+        is_manually_adjusted BOOLEAN DEFAULT FALSE,
+        notes TEXT,
+        UNIQUE(budget_plan_id, account_id, fund_type)
+      )', s, s, s);
+
+    -- Indexes
+    EXECUTE format('CREATE INDEX IF NOT EXISTS idx_%s_bp_year ON %I.budget_plans(fiscal_year)', replace(s, 'tenant_', ''), s);
+    EXECUTE format('CREATE INDEX IF NOT EXISTS idx_%s_bp_status ON %I.budget_plans(status)', replace(s, 'tenant_', ''), s);
+    EXECUTE format('CREATE INDEX IF NOT EXISTS idx_%s_bpl_plan ON %I.budget_plan_lines(budget_plan_id)', replace(s, 'tenant_', ''), s);
+
+    RAISE NOTICE 'Migrated schema: %', s;
+  END LOOP;
+END;
+$migration$;