feat: T4b/T4c wave 8 - weather history, phenology, honey chain, Telegram base

- Weather history from Open-Meteo behind an adapter: worker loop
  phenology-weather with backoff, Retry-After, User-Agent, chunked
  writes and forecast-to-archive correction
- Phenology: growing degree sum per DWD, phase from reports, GTS and
  calendar, calibration from previous years, daily job step,
  SeasonService reads the stored state
- Honey chain: prefill for extractions and batches (proposals only),
  plausibility and withdrawal warnings, Extraction lock, chain events
  and batch.created webhook from HoneyBatchRecorded
- Telegram base: schema, NotificationDelivery outbox, hardened bot
  client, startup check without crash, no-network-outside-loops guard
- ARCHITECTURE.md: sections 11.11-11.13, assumptions 42-46, env table

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

ApiCore-Backend/prisma/schema.prisma

@@ -127,6 +127,9 @@ model User {
   rawMaterialLots        RawMaterialLot[]
   notifications          Notification[]
   notificationPreference NotificationPreference?
+  telegramLink           TelegramLink?
+  telegramLinkTokens     TelegramLinkToken[]
+  notificationDeliveries NotificationDelivery[]
   queenEvaluations       QueenEvaluation[]
   webhookSubscriptions   WebhookSubscription[]
   documents              Document[]
@@ -1408,19 +1411,20 @@ enum NotificationCategory {
 // beim Schreiben). requiredPermissions = Rechte des Empfaengers plus Rechte
 // des Inhalts; dedupeKey = "<praefix>:<userId>".
 model Notification {
-  id                  String               @id @default(cuid())
+  id                  String                 @id @default(cuid())
   userId              String
-  user                User                 @relation(fields: [userId], references: [id], onDelete: Cascade)
+  user                User                   @relation(fields: [userId], references: [id], onDelete: Cascade)
   priority            NotificationPriority
   category            NotificationCategory
   message             String
   relatedType         String?
   relatedId           String?
   link                String?
-  requiredPermissions String[]             @default([])
-  dedupeKey           String?              @unique
-  read                Boolean              @default(false)
-  createdAt           DateTime             @default(now())
+  requiredPermissions String[]               @default([])
+  dedupeKey           String?                @unique
+  read                Boolean                @default(false)
+  createdAt           DateTime               @default(now())
+  deliveries          NotificationDelivery[]
 
   @@index([userId, read])
   @@index([priority])
@@ -1441,6 +1445,78 @@ model NotificationPreference {
   updatedAt          DateTime               @updatedAt
 }
 
+enum NotificationChannel {
+  TELEGRAM
+}
+
+enum NotificationDeliveryStatus {
+  PENDING
+  PROCESSING
+  DELIVERED
+  SKIPPED
+  FAILED
+}
+
+// Chat binding of a user to this deployment's Telegram bot (T4c). One private
+// chat belongs to exactly one user.
+model TelegramLink {
+  userId            String   @id
+  user              User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  chatId            BigInt   @unique
+  telegramFirstName String?
+  linkedAt          DateTime @default(now())
+}
+
+// Single-use link token, valid for 10 minutes; only the SHA-256 is stored.
+model TelegramLinkToken {
+  id         String    @id @default(cuid())
+  userId     String
+  user       User      @relation(fields: [userId], references: [id], onDelete: Cascade)
+  tokenHash  String    @unique
+  expiresAt  DateTime
+  consumedAt DateTime?
+  createdAt  DateTime  @default(now())
+
+  @@index([userId])
+}
+
+// Outbox like WebhookDelivery. The text is not stored: the sender renders it
+// from the Notification or the templateCode. CHECK (migration): exactly one of
+// (notificationId with userId) or (templateCode with chatId).
+model NotificationDelivery {
+  id             String                     @id @default(cuid())
+  channel        NotificationChannel
+  userId         String?
+  user           User?                      @relation(fields: [userId], references: [id], onDelete: Cascade)
+  chatId         BigInt?
+  notificationId String?
+  notification   Notification?              @relation(fields: [notificationId], references: [id], onDelete: Cascade)
+  templateCode   String?
+  status         NotificationDeliveryStatus @default(PENDING)
+  attempts       Int                        @default(0)
+  availableAt    DateTime                   @default(now())
+  claimedAt      DateTime?
+  lastStatusCode Int?
+  lastError      String?
+  deliveredAt    DateTime?
+  createdAt      DateTime                   @default(now())
+
+  @@unique([notificationId, channel])
+  @@index([status, availableAt])
+  @@index([userId, createdAt])
+  @@index([notificationId])
+}
+
+// One row: update offset and poll lease of the Telegram receiver.
+model TelegramPollState {
+  id           String    @id @default("singleton")
+  updateOffset BigInt    @default(0)
+  leaseOwner   String?
+  leaseUntil   DateTime?
+  lastPollAt   DateTime?
+  lastError    String?
+}
+
 // ---------------------------------------------------------------------------
 // Webhooks (Abschnitt 27) – v1.x Modul 28
 // ---------------------------------------------------------------------------