feat: Line invoice fetcher testing

1. query line  invoice data
2. TODO line login

app/lineinvoicefetcher.py

@@ -0,0 +1,71 @@
+import requests
+
+SESSION_TOKEN = "r:df33fc57ed1b792131eb0eb24f8715a3"
+
+headers = {
+    "Cookie": "_ldbrbid=tr__k1y/XGTcLDWeHW1fMcteAg==",
+    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)",
+    "x-parse-session-token": SESSION_TOKEN,
+    "x-parse-application-id": "line-invoice",
+    "Content-Type": "application/json",
+}
+
+def get_invoices(period_code, end_cursor=None):
+    payload = {
+        "operationName": "GetInvoices",
+        "variables": {
+            "periodCode": period_code,
+            **({"endCursor": end_cursor} if end_cursor else {})
+        },
+        "query": """query GetInvoices($periodCode: String!, $endCursor: String) {
+  invoices(
+    where: {periodCode: {equalTo: $periodCode}, status: {notEqualTo: "ERROR"}}
+    first: 50
+    after: $endCursor
+  ) {
+    edges {
+      node {
+        amount
+        brandName
+        category
+        createdAt
+        invoiceDate
+        lineItems {
+          ... on Element {
+            value
+          }
+        }
+        sellerName
+        serial
+      }
+    }
+    pageInfo {
+      hasNextPage
+      endCursor
+    }
+  }
+}"""
+    }
+    r = requests.post("https://invoice.line.me/graphql", headers=headers, json=payload)
+    return r.json()
+
+# 拿所有發票（自動翻頁）
+def get_all_invoices(period_code):
+    all_invoices = []
+    end_cursor = None
+    while True:
+        data = get_invoices(period_code, end_cursor)
+        edges = data["data"]["invoices"]["edges"]
+        all_invoices.extend([e["node"] for e in edges])
+        page_info = data["data"]["invoices"]["pageInfo"]
+        if not page_info["hasNextPage"]:
+            break
+        end_cursor = page_info["endCursor"]
+    return all_invoices
+
+# 民國期別：11401=1-2月, 11403=3-4月, ..., 11412=11-12月
+invoices = get_all_invoices("11502")
+print(f"共 {len(invoices)} 張發票")
+for inv in invoices:
+    # print(f"{inv}")
+    print(f"{inv['invoiceDate'][:10]} {inv['brandName']} {inv['sellerName']} ${inv['amount']}")