fix: use Optional[str] for Python 3.9 compatibility

Pydantic evaluates type annotations at runtime, so `str | None`
syntax fails on Python 3.9. Use Optional[str] in Pydantic models.

Also ignore UP007 lint rule for platforms since this is intentional.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: lorey

pyproject.toml

@@ -81,6 +81,9 @@ ignore = [
 "socials/cli.py" = [
     "FBT001",  # typer requires boolean positional args
 ]
+"socials/platforms/*.py" = [
+    "UP007",   # Pydantic needs Optional[X] for Python 3.9 runtime evaluation
+]
 
 [tool.ruff.lint.isort]
 known-first-party = ["socials"]

socials/platforms/facebook.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import re
-from typing import TYPE_CHECKING, ClassVar, Literal
+from typing import TYPE_CHECKING, ClassVar, Literal, Optional
 
 from pydantic import BaseModel
 
@@ -28,8 +28,8 @@ class FacebookProfileURL(BaseModel, frozen=True):
     url: str
     platform: Literal["facebook"] = "facebook"
     entity_type: Literal["profile"] = "profile"
-    username: str | None = None
-    user_id: str | None = None
+    username: Optional[str] = None
+    user_id: Optional[str] = None
 
     def __hash__(self) -> int:
         """Return hash based on URL."""

socials/platforms/youtube.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import re
-from typing import TYPE_CHECKING, ClassVar, Literal
+from typing import TYPE_CHECKING, ClassVar, Literal, Optional
 
 from pydantic import BaseModel
 
@@ -40,9 +40,9 @@ class YouTubeChannelURL(BaseModel, frozen=True):
     url: str
     platform: Literal["youtube"] = "youtube"
     entity_type: Literal["channel"] = "channel"
-    channel_id: str | None = None
-    username: str | None = None
-    custom_url: str | None = None
+    channel_id: Optional[str] = None
+    username: Optional[str] = None
+    custom_url: Optional[str] = None
 
     def __hash__(self) -> int:
         """Return hash based on URL."""