Expand financials surfaces with ratios, KPIs, and cadence support

- Add bundled financial modeling pipeline (ratios, KPI dimensions/notes, trend series, standardization)
- Introduce company financial bundles storage (Drizzle migration + repo wiring)
- Refactor financials page/API/query flow to use surfaceKind + cadence and new response shapes

lib/server/financials/bundles.ts

@@ -0,0 +1,53 @@
+import type {
+  FinancialCadence,
+  FinancialSurfaceKind
+} from '@/lib/types';
+import {
+  getCompanyFinancialBundle,
+  upsertCompanyFinancialBundle
+} from '@/lib/server/repos/company-financial-bundles';
+import type { FilingTaxonomySnapshotRecord } from '@/lib/server/repos/filing-taxonomy';
+
+export function computeSourceSignature(snapshots: FilingTaxonomySnapshotRecord[]) {
+  return snapshots
+    .map((snapshot) => `${snapshot.id}:${snapshot.updated_at}`)
+    .sort((left, right) => left.localeCompare(right))
+    .join('|');
+}
+
+export async function readCachedFinancialBundle(input: {
+  ticker: string;
+  surfaceKind: FinancialSurfaceKind;
+  cadence: FinancialCadence;
+  snapshots: FilingTaxonomySnapshotRecord[];
+}) {
+  const sourceSignature = computeSourceSignature(input.snapshots);
+  const cached = await getCompanyFinancialBundle({
+    ticker: input.ticker,
+    surfaceKind: input.surfaceKind,
+    cadence: input.cadence
+  });
+
+  if (!cached || cached.source_signature !== sourceSignature) {
+    return null;
+  }
+
+  return cached.payload;
+}
+
+export async function writeFinancialBundle(input: {
+  ticker: string;
+  surfaceKind: FinancialSurfaceKind;
+  cadence: FinancialCadence;
+  snapshots: FilingTaxonomySnapshotRecord[];
+  payload: Record<string, unknown>;
+}) {
+  return await upsertCompanyFinancialBundle({
+    ticker: input.ticker,
+    surfaceKind: input.surfaceKind,
+    cadence: input.cadence,
+    sourceSnapshotIds: input.snapshots.map((snapshot) => snapshot.id),
+    sourceSignature: computeSourceSignature(input.snapshots),
+    payload: input.payload
+  });
+}