fix(types): replace structural DB types with Pick<PrismaClient> and remove Prisma boundary as any casts

Replace ~440 lines of hand-written structural DB client types across 7 lib files
with `Pick<PrismaClient, ...>` from @capakraken/db. This eliminates all `as any`
casts at Prisma boundaries (cron routes, allocation effects, vacation procedures)
and surfaces two pre-existing bugs:
- weekly-digest.ts: `db.allocation.count()` called non-existent model (fixed → demandRequirement)
- estimate-reminders.ts: `submittedAt` field doesn't exist on EstimateVersion (fixed → updatedAt)

Also adds root eslint.config.mjs so lint-staged can lint package files.

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

packages/application/src/use-cases/vacation/approve-vacation.ts

@@ -1,14 +1,11 @@
-import type { Prisma, PrismaClient, VacationStatus } from "@capakraken/db";
+import type { Prisma, PrismaClient, VacationStatus, VacationType } from "@capakraken/db";
 import { TRPCError } from "@trpc/server";
 
-type DbClient = Pick<
-  PrismaClient,
-  "vacation" | "user" | "resource" | "notification"
->;
+type DbClient = PrismaClient;
 
 export type VacationChargeableInput = {
   resourceId: string;
-  type: string;
+  type: VacationType;
   startDate: Date;
   endDate: Date;
   isHalfDay: boolean;
@@ -16,10 +13,7 @@ export type VacationChargeableInput = {
 
 export type ApproveVacationDeps = {
   assertVacationApprovable: (status: VacationStatus) => void;
-  assertVacationStillChargeable: (
-    db: DbClient,
-    vacation: VacationChargeableInput,
-  ) => Promise<void>;
+  assertVacationStillChargeable: (db: DbClient, vacation: VacationChargeableInput) => Promise<void>;
   buildVacationApprovalWriteData: (
     db: DbClient,
     vacation: VacationChargeableInput,
@@ -75,11 +69,7 @@ export async function approveVacation(
     isHalfDay: existing.isHalfDay,
   });
 
-  const conflictResult = await deps.checkVacationConflicts(
-    db,
-    input.id,
-    input.actorUserId,
-  );
+  const conflictResult = await deps.checkVacationConflicts(db, input.id, input.actorUserId);
 
   const updated = await db.vacation.update({
     where: { id: input.id },
@@ -98,10 +88,7 @@ export async function approveVacation(
 }
 
 export type BatchApproveVacationDeps = {
-  assertVacationStillChargeable: (
-    db: DbClient,
-    vacation: VacationChargeableInput,
-  ) => Promise<void>;
+  assertVacationStillChargeable: (db: DbClient, vacation: VacationChargeableInput) => Promise<void>;
   buildVacationApprovalWriteData: (
     db: DbClient,
     vacation: VacationChargeableInput,
@@ -139,14 +126,7 @@ export async function batchApproveVacations(
   input: BatchApproveVacationInput,
   deps: BatchApproveVacationDeps,
 ): Promise<BatchApproveVacationResult> {
-  const vacations: Array<{
-    id: string;
-    resourceId: string;
-    type: string;
-    startDate: Date;
-    endDate: Date;
-    isHalfDay: boolean;
-  }> = await db.vacation.findMany({
+  const vacations = await db.vacation.findMany({
     where: { id: { in: input.ids }, status: "PENDING" },
     select: {
       id: true,
@@ -171,10 +151,7 @@ export async function batchApproveVacations(
   const updatedVacations: BatchApproveVacationResult["updatedVacations"] = [];
 
   for (const vacation of vacations) {
-    const deductionSnapshotWriteData = await deps.buildVacationApprovalWriteData(
-      db,
-      vacation,
-    );
+    const deductionSnapshotWriteData = await deps.buildVacationApprovalWriteData(db, vacation);
 
     const updated = await db.vacation.update({
       where: { id: vacation.id },