fix: keep quantities, colony/queen states and tasks consistent under retries

Data-integrity fixes found in a systematic review of ApiCore:

- Bottling booked the honey batch amount from a value read outside the
  transaction and wrote an absolute result back, so two concurrent
  bottlings (double tap, two devices) could both pass the check and one
  deduction was lost. Bookings now use a conditional UPDATE inside the
  transaction; corrections and deletions give amounts back atomically.
- Outgoing stock movements could drive stock below zero; the removal is
  now a conditional decrement that refuses when stock is insufficient.
- Weak, conspicuous and queenless colonies were treated as "not active"
  and could not be moved, split or merged - uniting a queenless colony
  is the textbook merge. Only terminal statuses lock a colony now; merging
  a colony into itself and dissolving twice are rejected.
- Moving a queen to another colony failed on the unique currentQueenId
  because the old colony kept pointing at her. The old colony now releases
  her (and becomes QUEENLESS); a queenless colony receiving a queen becomes
  ACTIVE; dissolved colonies cannot receive a queen.
- Completing a task twice moved completedAt and re-sent the webhook;
  reopening a task kept completedAt. Recurring templates created tasks
  without a due date and caught up missed weeks one stale task at a time.
- Automation rules created a new task and warning on every trigger (every
  stock removal below minimum). Tasks now record their source trigger and
  at most one open task per rule and object exists. The varroa threshold
  (mites per day) is only compared with natural-mite-fall rates, not with
  sample-based counts in another unit.
- New opt-in Idempotency-Key support for record-creating endpoints, so
  the offline queue can retry after a lost response without duplicates.
- Permission catalog sync crashed replicas booting concurrently on a
  fresh database (unique violation); it now uses createMany/skipDuplicates.
- Server-side validation for inspection rating scales (1-5), unique
  colony/harvest lists and net weight <= gross weight.
- Stale e2e expectations updated (permission count, trigger list, real PNG
  fixture for the file-signature check).

Migration is additive only (nullable Task column, new table).

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/src/colonies/colonies.service.ts

@@ -1,4 +1,5 @@
 import {
+  BadRequestException,
   ConflictException,
   Injectable,
   NotFoundException,
@@ -13,6 +14,7 @@ import { UpdateColonyDto } from './dto/update-colony.dto';
 import { MoveColonyDto } from './dto/move-colony.dto';
 import { SplitColonyDto } from './dto/split-colony.dto';
 import { MergeColonyDto } from './dto/merge-colony.dto';
+import { isLivingColonyStatus } from './colony-status';
 
 export interface ColonyFilter {
   status?: ColonyStatus;
@@ -43,10 +45,13 @@ export class ColoniesService {
     return colony;
   }
 
+  // Only a colony that no longer exists (dissolved, sold, dead, merged) is
+  // locked. Weak, conspicuous or queenless colonies are still worked with -
+  // uniting a queenless colony with another is the textbook case for merge.
   private assertActive(colony: Colony): void {
-    if (colony.status !== 'ACTIVE') {
+    if (!isLivingColonyStatus(colony.status)) {
       throw new ConflictException(
-        `Das Volk ist nicht aktiv (Status: ${colony.status})`,
+        `Das Volk besteht nicht mehr (Status: ${colony.status})`,
       );
     }
   }
@@ -206,6 +211,16 @@ export class ColoniesService {
   ): Promise<Colony> {
     const survivor = await this.findById(id);
     this.assertActive(survivor);
+    if (dto.mergedColonyIds.includes(survivor.id)) {
+      throw new BadRequestException(
+        'Ein Volk kann nicht mit sich selbst vereinigt werden',
+      );
+    }
+    if (new Set(dto.mergedColonyIds).size !== dto.mergedColonyIds.length) {
+      throw new BadRequestException(
+        'Jedes Volk darf nur einmal zur Vereinigung ausgewählt werden',
+      );
+    }
     await this.prisma.$transaction(async (tx) => {
       for (const mergedColonyId of dto.mergedColonyIds) {
         const merged = await tx.colony.findUnique({
@@ -265,6 +280,9 @@ export class ColoniesService {
 
   async dissolve(id: string, actingUserId: string): Promise<Colony> {
     const before = await this.findById(id);
+    // Re-dissolving would overwrite deactivatedAt and the terminal status
+    // (e.g. MERGED -> DISSOLVED), losing when and how the colony really ended.
+    this.assertActive(before);
     const colony = await this.prisma.$transaction(async (tx) => {
       const updated = await tx.colony.update({
         where: { id },