feat: unlink and delete buttons for links on project detail page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

routers/projects.py

@@ -417,3 +417,27 @@ async def remove_contact(
         "DELETE FROM contact_projects WHERE contact_id = :cid AND project_id = :pid"
     ), {"cid": contact_id, "pid": project_id})
     return RedirectResponse(url=f"/projects/{project_id}?tab=contacts", status_code=303)
+
+
+# ---- Link unlinking ----
+
+@router.post("/{project_id}/links/{link_id}/unlink")
+async def unlink_link(
+    project_id: str, link_id: str,
+    db: AsyncSession = Depends(get_db),
+):
+    await db.execute(text(
+        "UPDATE links SET project_id = NULL, updated_at = now() WHERE id = :lid AND project_id = :pid"
+    ), {"lid": link_id, "pid": project_id})
+    await db.commit()
+    return RedirectResponse(url=f"/projects/{project_id}?tab=links", status_code=303)
+
+
+@router.post("/{project_id}/links/{link_id}/delete")
+async def delete_project_link(
+    project_id: str, link_id: str,
+    db: AsyncSession = Depends(get_db),
+):
+    repo = BaseRepository("links", db)
+    await repo.soft_delete(link_id)
+    return RedirectResponse(url=f"/projects/{project_id}?tab=links", status_code=303)