feat(plan): sabit gelir/gider kalemleri ve dönem notları (backend)

- /api/periods/{id}/plan-items: listele, ekle; /api/plan-items/{id}: düzenle, sil
- Önceki dönemden kopyala: göreli gün korunur, dönem sonuna kırpılır, aynı kalem tekrar eklenmez
- /api/periods/{id}/notes (planning | review), /api/notes/{id}: Markdown notlar
- Kapalı dönemde değişiklik yok; silme geri alınabilir şekilde işaretlenir
- Entegrasyon testleri (5): kurallar, kopyalama, salt okunur dönem, hane izolasyonu

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

frontend/src/types/CopyPreviousResult.ts

@@ -0,0 +1,7 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export type CopyPreviousResult = { 
+/**
+ * Eklenen kalem sayısı (zaten var olanlar atlanır)
+ */
+added: number, };

frontend/src/types/Note.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { NoteContext } from "./NoteContext";
+
+export type Note = { id: string, context: NoteContext, title: string, body_md: string, created_by: string, 
+/**
+ * ISO 8601
+ */
+updated_at: string, version: number, };

frontend/src/types/NoteContext.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * Notun bağlı olduğu sayfa
+ */
+export type NoteContext = "planning" | "review";

frontend/src/types/NoteCreateRequest.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { NoteContext } from "./NoteContext";
+
+export type NoteCreateRequest = { context: NoteContext, title: string, 
+/**
+ * Markdown
+ */
+body_md: string, };

frontend/src/types/NoteUpdateRequest.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export type NoteUpdateRequest = { title?: string, body_md?: string, version?: number, };

frontend/src/types/PlanItem.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { PlanItemKind } from "./PlanItemKind";
+
+export type PlanItem = { id: string, kind: PlanItemKind, name: string, 
+/**
+ * Kuruş
+ */
+amount: number, date: string | null, sort_order: number, version: number, };

frontend/src/types/PlanItemCreateRequest.ts

@@ -0,0 +1,12 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { PlanItemKind } from "./PlanItemKind";
+
+export type PlanItemCreateRequest = { kind: PlanItemKind, name: string, 
+/**
+ * Kuruş, > 0
+ */
+amount: number, 
+/**
+ * `"YYYY-MM-DD"`, dönem içinde (isteğe bağlı)
+ */
+date?: string, };

frontend/src/types/PlanItemKind.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export type PlanItemKind = "income" | "expense";

frontend/src/types/PlanItemUpdateRequest.ts

@@ -0,0 +1,7 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export type PlanItemUpdateRequest = { name?: string, amount?: number, 
+/**
+ * Boş metin → tarihi kaldır
+ */
+date?: string, version?: number, };