chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/pypika/enums.py

@@ -0,0 +1,157 @@
+from enum import Enum
+from typing import Any
+
+__author__ = "Timothy Heys"
+__email__ = "theys@kayak.com"
+
+
+class Arithmetic(Enum):
+    add = "+"
+    sub = "-"
+    mul = "*"
+    div = "/"
+    lshift = "<<"
+    rshift = ">>"
+
+
+class Comparator(Enum):
+    pass
+
+
+class Equality(Comparator):
+    eq = "="
+    ne = "<>"
+    gt = ">"
+    gte = ">="
+    lt = "<"
+    lte = "<="
+
+
+class Matching(Comparator):
+    not_like = " NOT LIKE "
+    like = " LIKE "
+    not_ilike = " NOT ILIKE "
+    ilike = " ILIKE "
+    rlike = " RLIKE "
+    regex = " REGEX "
+    regexp = " REGEXP "
+    bin_regex = " REGEX BINARY "
+    as_of = " AS OF "
+    glob = " GLOB "
+
+
+class Boolean(Comparator):
+    and_ = "AND"
+    or_ = "OR"
+    xor_ = "XOR"
+    true = "TRUE"
+    false = "FALSE"
+
+
+class Order(Enum):
+    asc = "ASC"
+    desc = "DESC"
+
+
+class JoinType(Enum):
+    inner = ""
+    left = "LEFT"
+    right = "RIGHT"
+    outer = "FULL OUTER"
+    left_outer = "LEFT OUTER"
+    right_outer = "RIGHT OUTER"
+    full_outer = "FULL OUTER"
+    cross = "CROSS"
+    hash = "HASH"
+
+
+class ReferenceOption(Enum):
+    cascade = "CASCADE"
+    no_action = "NO ACTION"
+    restrict = "RESTRICT"
+    set_null = "SET NULL"
+    set_default = "SET DEFAULT"
+
+
+class SetOperation(Enum):
+    union = "UNION"
+    union_all = "UNION ALL"
+    intersect = "INTERSECT"
+    except_of = "EXCEPT"
+    minus = "MINUS"
+
+
+class DatePart(Enum):
+    year = "YEAR"
+    quarter = "QUARTER"
+    month = "MONTH"
+    week = "WEEK"
+    day = "DAY"
+    hour = "HOUR"
+    minute = "MINUTE"
+    second = "SECOND"
+    microsecond = "MICROSECOND"
+
+
+class SqlType:
+    def __init__(self, name: str) -> None:
+        self.name = name
+
+    def __call__(self, length: int) -> "SqlTypeLength":
+        return SqlTypeLength(self.name, length)
+
+    def get_sql(self, **kwargs: Any) -> str:
+        return "{name}".format(name=self.name)
+
+
+class SqlTypeLength:
+    def __init__(self, name: str, length: int) -> None:
+        self.name = name
+        self.length = length
+
+    def get_sql(self, **kwargs: Any) -> str:
+        return "{name}({length})".format(name=self.name, length=self.length)
+
+
+class SqlTypes:
+    BOOLEAN = "BOOLEAN"
+    INTEGER = "INTEGER"
+    FLOAT = "FLOAT"
+    NUMERIC = "NUMERIC"
+    SIGNED = "SIGNED"
+    UNSIGNED = "UNSIGNED"
+
+    DATE = "DATE"
+    TIME = "TIME"
+    TIMESTAMP = "TIMESTAMP"
+
+    CHAR = SqlType("CHAR")
+    VARCHAR = SqlType("VARCHAR")
+    LONG_VARCHAR = SqlType("LONG VARCHAR")
+    BINARY = SqlType("BINARY")
+    VARBINARY = SqlType("VARBINARY")
+    LONG_VARBINARY = SqlType("LONG VARBINARY")
+
+
+class Dialects(Enum):
+    VERTICA = "vertica"
+    CLICKHOUSE = "clickhouse"
+    ORACLE = "oracle"
+    MSSQL = "mssql"
+    MYSQL = "mysql"
+    POSTGRESQL = "postgressql"
+    REDSHIFT = "redshift"
+    SQLLITE = "sqllite"
+    SNOWFLAKE = "snowflake"
+
+
+class JSONOperators(Enum):
+    HAS_KEY = "?"
+    CONTAINS = "@>"
+    CONTAINED_BY = "<@"
+    HAS_KEYS = "?&"
+    HAS_ANY_KEYS = "?|"
+    GET_JSON_VALUE = "->"
+    GET_TEXT_VALUE = "->>"
+    GET_PATH_JSON_VALUE = "#>"
+    GET_PATH_TEXT_VALUE = "#>>"