Add the rough power balance module for early design phases

In LPH 2/3 there are no circuits yet, but the office needs a power
balance by DIN 276 cost group, as in the Excel template "Leistungsbilanz -
KG400": each trade enters consumers by piece or by area (W/m²) with GLF
and cos phi; the balance sums AV and SV per cost group, adds a reserve and
derives the maximum current.

The module is separate from the circuit structure: own tables
(migration 0010), own folder src/estimate-balance and an import-free
shared calculation used by API and UI. Writes go through project commands
(estimate-balance.insert/.update/.delete with complete documents), so
revision checks and Undo/Redo apply; it is not part of project snapshots
or transfer yet. A comparison endpoint sums the device rows of all circuit
lists by cost group (longest prefix) against the estimate.

The UI adds a sidebar entry, a list of Stände (template KG 400, empty or
copy) and a spreadsheet-like editor with autosave, AMEV picker for the
GLF, totals, reserve, maximum current, comparison table and print layout.
The tests reproduce the template example exactly (143.24 kW, 148.48 kVA,
157.56 kW / 163.33 kVA with 10 % reserve, 235.75 A). See
docs/estimate-balance.md and issue #7.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/server/controllers/estimate-balance.controller.ts

@@ -0,0 +1,180 @@
+import type { Request, Response } from "express";
+import { ZodError } from "zod";
+import {
+  createEstimateBalanceDeleteProjectCommand,
+  createEstimateBalanceInsertProjectCommand,
+  createEstimateBalanceSnapshot,
+  createEstimateBalanceUpdateProjectCommand,
+  parseEstimateBalanceSnapshot,
+  sameEstimateBalance,
+} from "../../estimate-balance/domain/estimate-balance-command.model.js";
+import {
+  createEstimateBalanceRequestSchema,
+  deleteEstimateBalanceRequestSchema,
+  updateEstimateBalanceRequestSchema,
+} from "../../estimate-balance/api/estimate-balance-request.schemas.js";
+import { compareEstimateWithDetailed } from "../../shared/estimate-balance/estimate-balance.js";
+import { estimateBalanceRepository } from "../composition/application-repositories.js";
+import { projectCommandService } from "../composition/project-command-stores.js";
+import { respondWithProjectCommandError } from "./project-command.controller.js";
+
+function params(req: Request) {
+  const { projectId, balanceId } = req.params;
+  return {
+    projectId: typeof projectId === "string" ? projectId : null,
+    balanceId: typeof balanceId === "string" ? balanceId : null,
+  };
+}
+
+export function listEstimateBalances(req: Request, res: Response) {
+  const { projectId } = params(req);
+  if (!projectId) {
+    return res.status(400).json({ error: "Ungültige Projekt-ID." });
+  }
+  return res.json(estimateBalanceRepository.listByProject(projectId));
+}
+
+export function getEstimateBalance(req: Request, res: Response) {
+  const { projectId, balanceId } = params(req);
+  if (!projectId || !balanceId) {
+    return res.status(400).json({ error: "Ungültige Parameter." });
+  }
+  const balance = estimateBalanceRepository.findById(projectId, balanceId);
+  if (!balance) {
+    return res.status(404).json({ error: "Grobe Leistungsbilanz nicht gefunden." });
+  }
+  return res.json(balance);
+}
+
+export function createEstimateBalance(req: Request, res: Response) {
+  const { projectId } = params(req);
+  if (!projectId) {
+    return res.status(400).json({ error: "Ungültige Projekt-ID." });
+  }
+  const parsed = createEstimateBalanceRequestSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  let template: Parameters<typeof createEstimateBalanceSnapshot>[0]["template"] =
+    parsed.data.template === "copy" ? "empty" : parsed.data.template;
+  if (parsed.data.template === "copy") {
+    const source = estimateBalanceRepository.findById(
+      projectId,
+      parsed.data.copyFromBalanceId!
+    );
+    if (!source) {
+      return res
+        .status(404)
+        .json({ error: "Der zu kopierende Stand wurde nicht gefunden." });
+    }
+    template = { copyFrom: source };
+  }
+  try {
+    const balance = createEstimateBalanceSnapshot({
+      projectId,
+      name: parsed.data.name,
+      workStage: parsed.data.workStage ?? null,
+      dateIso: parsed.data.dateIso ?? null,
+      sortOrder: estimateBalanceRepository.nextSortOrder(projectId),
+      template,
+    });
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Grobe Leistungsbilanz anlegen",
+      command: createEstimateBalanceInsertProjectCommand(balance),
+    });
+    return res.status(201).json({ ...result, balance });
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}
+
+export function updateEstimateBalance(req: Request, res: Response) {
+  const { projectId, balanceId } = params(req);
+  if (!projectId || !balanceId) {
+    return res.status(400).json({ error: "Ungültige Parameter." });
+  }
+  const parsed = updateEstimateBalanceRequestSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  let target;
+  try {
+    target = parseEstimateBalanceSnapshot(parsed.data.balance);
+  } catch (error) {
+    return res.status(400).json({
+      error: "Die grobe Leistungsbilanz enthält ungültige Werte.",
+      issues: error instanceof ZodError ? error.issues : undefined,
+    });
+  }
+  if (target.id !== balanceId || target.projectId !== projectId) {
+    return res
+      .status(400)
+      .json({ error: "Die Bilanz gehört nicht zu diesem Projekt oder dieser Adresse." });
+  }
+  const current = estimateBalanceRepository.findById(projectId, balanceId);
+  if (!current) {
+    return res.status(404).json({ error: "Grobe Leistungsbilanz nicht gefunden." });
+  }
+  if (sameEstimateBalance(current, target)) {
+    return res.json({ unchanged: true, balance: current });
+  }
+  try {
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Grobe Leistungsbilanz bearbeiten",
+      command: createEstimateBalanceUpdateProjectCommand(current, target),
+    });
+    return res.json({
+      ...result,
+      balance: estimateBalanceRepository.findById(projectId, balanceId),
+    });
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}
+
+export function deleteEstimateBalance(req: Request, res: Response) {
+  const { projectId, balanceId } = params(req);
+  if (!projectId || !balanceId) {
+    return res.status(400).json({ error: "Ungültige Parameter." });
+  }
+  const parsed = deleteEstimateBalanceRequestSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  const current = estimateBalanceRepository.findById(projectId, balanceId);
+  if (!current) {
+    return res.status(404).json({ error: "Grobe Leistungsbilanz nicht gefunden." });
+  }
+  try {
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Grobe Leistungsbilanz löschen",
+      command: createEstimateBalanceDeleteProjectCommand(current),
+    });
+    return res.json(result);
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}
+
+export function getEstimateComparison(req: Request, res: Response) {
+  const { projectId, balanceId } = params(req);
+  if (!projectId || !balanceId) {
+    return res.status(400).json({ error: "Ungültige Parameter." });
+  }
+  const balance = estimateBalanceRepository.findById(projectId, balanceId);
+  if (!balance) {
+    return res.status(404).json({ error: "Grobe Leistungsbilanz nicht gefunden." });
+  }
+  return res.json(
+    compareEstimateWithDetailed(
+      balance,
+      estimateBalanceRepository.listDetailedDeviceRowPower(projectId)
+    )
+  );
+}