Phase 5: AI investment planning - CD rate fetcher and AI recommendation engine

- Add shared.cd_rates table for cross-tenant market data (CD rates from Bankrate)
- Create standalone Puppeteer scraper script (scripts/fetch-cd-rates.ts) for cron-based rate fetching
- Add investment-planning backend module with 3 endpoints: snapshot, cd-rates, recommendations
- AI service gathers tenant financial data (accounts, investments, budgets, projects, cash flow) and calls OpenAI-compatible API (NVIDIA endpoint) for structured investment recommendations
- Create InvestmentPlanningPage with summary cards, current investments table, market CD rates table, and AI recommendation accordion
- Add Investment Planning to sidebar under Planning menu
- Configure AI_API_URL, AI_API_KEY, AI_MODEL environment variables

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

db/migrations/005-cd-rates.sql

@@ -0,0 +1,17 @@
+-- Migration: Add CD rates table to shared schema
+-- For existing deployments that already have the shared schema initialized
+
+CREATE TABLE IF NOT EXISTS shared.cd_rates (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    bank_name VARCHAR(255) NOT NULL,
+    apy DECIMAL(6,4) NOT NULL,
+    min_deposit DECIMAL(15,2),
+    term VARCHAR(100) NOT NULL,
+    term_months INTEGER,
+    fetched_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    source_url VARCHAR(500),
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_cd_rates_fetched ON shared.cd_rates(fetched_at DESC);
+CREATE INDEX IF NOT EXISTS idx_cd_rates_apy ON shared.cd_rates(apy DESC);