fix(portfolio): name 검증에 한글+공백 허용 (minor-change, CHG-20260627-03)

_PORTFOLIO_NAME_RE + CLI _NAME_RE를 ^[a-zA-Z0-9가-힣 ._:-]{1,100}$로 완화. name은 (owner,name) 조회 키일 뿐 wire 식별자 아님. 475 passed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VHtM5Ws1HKCKQ4JGi6GRb5

app/schemas/portfolio.py

@@ -9,7 +9,7 @@ import re as _re
 
 from pydantic import BaseModel, ConfigDict, Field, field_validator
 
-_PORTFOLIO_NAME_RE = _re.compile(r"^[a-zA-Z0-9._:\-]{1,100}$")
+_PORTFOLIO_NAME_RE = _re.compile(r"^[a-zA-Z0-9가-힣 ._:\-]{1,100}$")
 
 
 class StrategySetResponse(BaseModel):
@@ -90,7 +90,7 @@ class CreatePortfolioRequest(PortfolioBase):
     def validate_name(cls, v: str) -> str:
         if not _PORTFOLIO_NAME_RE.match(v):
             raise ValueError(
-                f"이름은 [a-zA-Z0-9._:-] 문자만 허용하며 1~100자여야 합니다: {v!r}"
+                f"이름은 한글·영문·숫자·공백·._:- 만 사용 가능하며 1~100자여야 합니다: {v!r}"
             )
         return v