feat(birikim): varlıklar ve alım/satım kayıtları (ortalama maliyet)

- Varsayılan varlıklar (TL, altınlar, USD, EUR) + migration v2 ile eski hanelere ekleme
- Döviz ekleme, varlık adı/aktifliği
- Alım/satım ekle, düzenle, sil; eldekinden fazla satış (geriye tarihli dahil) engellenir
- Ağırlıklı ortalama maliyet ve gerçekleşen kâr/zarar (hesaplanır, saklanmaz)

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

frontend/src/types/Asset.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 { AssetKind } from "./AssetKind";
+
+export type Asset = { id: string, kind: AssetKind, code: string, name: string, unit_label: string, sort_order: number, is_active: boolean, version: number, 
+/**
+ * Eldeki miktar (× 1e6)
+ */
+quantity_e6: number, 
+/**
+ * Eldeki miktarın maliyeti (kuruş)
+ */
+cost: number, 
+/**
+ * Birim başına ortalama maliyet (TL × 1e6); elde yoksa `null`
+ */
+avg_cost_e6: number | null, 
+/**
+ * Satışlardan gerçekleşen kâr/zarar (kuruş)
+ */
+realized_pl: number, tx_count: number, };

frontend/src/types/AssetCreateRequest.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 AssetCreateRequest = { 
+/**
+ * 3 harfli döviz kodu (ör. `GBP`)
+ */
+code: string, name: string, 
+/**
+ * Boşsa kod
+ */
+unit_label?: string, };

frontend/src/types/AssetKind.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 AssetKind = "cash" | "gold" | "fx";

frontend/src/types/AssetTransaction.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 { AssetTxType } from "./AssetTxType";
+
+export type AssetTransaction = { id: string, asset_id: string, type: AssetTxType, date: string, quantity_e6: number, 
+/**
+ * TL × 1e6
+ */
+unit_price_e6: number, 
+/**
+ * Kuruş
+ */
+total: number, note: string | null, 
+/**
+ * Dönem kapanışından geldiyse
+ */
+source_period_id: string | null, version: number, };

frontend/src/types/AssetTxCreateRequest.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 { AssetTxType } from "./AssetTxType";
+
+export type AssetTxCreateRequest = { type: AssetTxType, date: string, 
+/**
+ * × 1e6; TL varlığında yok sayılır
+ */
+quantity_e6?: number, 
+/**
+ * TL × 1e6; verilmezse tutar ÷ miktar
+ */
+unit_price_e6?: number, 
+/**
+ * Kuruş — ödenen / alınan gerçek tutar
+ */
+total: number, note?: string, };

frontend/src/types/AssetTxType.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 AssetTxType = "buy" | "sell";

frontend/src/types/AssetTxUpdateRequest.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 AssetTxUpdateRequest = { date?: string, quantity_e6?: number, unit_price_e6?: number, total?: number, 
+/**
+ * Boş metin → notu kaldır
+ */
+note?: string, version?: number, };

frontend/src/types/AssetUpdateRequest.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 AssetUpdateRequest = { name?: string, is_active?: boolean, version?: number, };