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>

backend/src/database/tenant-schema.service.ts

@@ -424,6 +424,41 @@ export class TenantSchemaService {
         updated_at TIMESTAMPTZ DEFAULT NOW()
       )`,
 
+      // Budget Plans
+      `CREATE TABLE "${s}".budget_plans (
+        id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+        fiscal_year INTEGER NOT NULL,
+        status VARCHAR(20) NOT NULL DEFAULT 'planning' CHECK (status IN ('planning', 'approved', 'ratified')),
+        base_year INTEGER NOT NULL,
+        inflation_rate DECIMAL(5,2) NOT NULL DEFAULT 2.50,
+        notes TEXT,
+        created_by UUID,
+        approved_by UUID,
+        approved_at TIMESTAMPTZ,
+        ratified_by UUID,
+        ratified_at TIMESTAMPTZ,
+        created_at TIMESTAMPTZ DEFAULT NOW(),
+        updated_at TIMESTAMPTZ DEFAULT NOW(),
+        UNIQUE(fiscal_year)
+      )`,
+
+      // Budget Plan Lines
+      `CREATE TABLE "${s}".budget_plan_lines (
+        id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+        budget_plan_id UUID NOT NULL REFERENCES "${s}".budget_plans(id) ON DELETE CASCADE,
+        account_id UUID NOT NULL REFERENCES "${s}".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)
+      )`,
+
       // Indexes
       `CREATE INDEX "idx_${s}_att_je" ON "${s}".attachments(journal_entry_id)`,
       `CREATE INDEX "idx_${s}_je_date" ON "${s}".journal_entries(entry_date)`,
@@ -439,6 +474,9 @@ export class TenantSchemaService {
       `CREATE INDEX "idx_${s}_bs_type_status" ON "${s}".board_scenarios(scenario_type, status)`,
       `CREATE INDEX "idx_${s}_si_scenario" ON "${s}".scenario_investments(scenario_id)`,
       `CREATE INDEX "idx_${s}_sa_scenario" ON "${s}".scenario_assessments(scenario_id)`,
+      `CREATE INDEX "idx_${s}_bp_year" ON "${s}".budget_plans(fiscal_year)`,
+      `CREATE INDEX "idx_${s}_bp_status" ON "${s}".budget_plans(status)`,
+      `CREATE INDEX "idx_${s}_bpl_plan" ON "${s}".budget_plan_lines(budget_plan_id)`,
     ];
   }