feat: add link_type field to quick links

Adds link_type column to quick_links table for iframe vs new_tab behavior.
Includes Alembic migration and schema updates.

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

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

src/domains/dashboard/models.py

@@ -31,6 +31,7 @@ class QuickLink(Base):
     # Ordering and display
     position = Column(Integer, default=0)
     is_visible = Column(Boolean, default=True)
+    link_type = Column(String(20), default="iframe")  # "iframe", "new_tab", etc.
 
     # Styling
     color = Column(String(20), nullable=True)  # Hex color for the link card

src/domains/dashboard/schemas.py

@@ -26,6 +26,7 @@ class QuickLinkCreate(QuickLinkBase):
     """Schema for creating a quick link"""
     position: Optional[int] = Field(0, ge=0, description="Display position")
     is_visible: Optional[bool] = Field(True, description="Whether link is visible")
+    link_type: Optional[str] = Field("iframe", max_length=20, description="Link type: iframe, new_tab")
 
 
 class QuickLinkUpdate(BaseSchema):
@@ -37,6 +38,7 @@ class QuickLinkUpdate(BaseSchema):
     category: Optional[str] = Field(None, max_length=50)
     position: Optional[int] = Field(None, ge=0)
     is_visible: Optional[bool] = None
+    link_type: Optional[str] = Field(None, max_length=20)
     color: Optional[str] = Field(None, max_length=20)
     background_color: Optional[str] = Field(None, max_length=20)
 
@@ -47,6 +49,7 @@ class QuickLinkResponse(QuickLinkBase):
     user_id: Optional[str] = None
     position: int
     is_visible: bool
+    link_type: str = "iframe"
     created_at: datetime
     updated_at: datetime