feat: add links to contacts with role (combo box with suggestions)

New contact_links junction table. Contact detail page shows linked links
with add form (link picker + role datalist combo) and unlink/edit actions.

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

routers/contacts.py

@@ -71,8 +71,27 @@ async def contact_detail(contact_id: str, request: Request, db: AsyncSession = D
     item = await repo.get(contact_id)
     if not item:
         return RedirectResponse(url="/contacts", status_code=303)
+
+    # Linked links
+    result = await db.execute(text("""
+        SELECT l.*, cl.role, cl.created_at as linked_at
+        FROM links l
+        JOIN contact_links cl ON cl.link_id = l.id
+        WHERE cl.contact_id = :cid AND l.is_deleted = false
+        ORDER BY l.label
+    """), {"cid": contact_id})
+    links = [dict(r._mapping) for r in result]
+
+    # All links for add dropdown
+    result = await db.execute(text("""
+        SELECT id, label, url FROM links
+        WHERE is_deleted = false ORDER BY label
+    """))
+    all_links = [dict(r._mapping) for r in result]
+
     return templates.TemplateResponse("contact_detail.html", {
         "request": request, "sidebar": sidebar, "item": item,
+        "links": links, "all_links": all_links,
         "page_title": f"{item['first_name']} {item.get('last_name', '')}".strip(),
         "active_nav": "contacts",
     })
@@ -126,6 +145,33 @@ async def delete_contact(contact_id: str, db: AsyncSession = Depends(get_db)):
     return RedirectResponse(url="/contacts", status_code=303)
 
 
+# ---- Link linking ----
+
+@router.post("/{contact_id}/links/add")
+async def add_link(
+    contact_id: str,
+    link_id: str = Form(...),
+    role: Optional[str] = Form(None),
+    db: AsyncSession = Depends(get_db),
+):
+    await db.execute(text("""
+        INSERT INTO contact_links (contact_id, link_id, role)
+        VALUES (:cid, :lid, :role) ON CONFLICT DO NOTHING
+    """), {"cid": contact_id, "lid": link_id, "role": role if role and role.strip() else None})
+    return RedirectResponse(url=f"/contacts/{contact_id}", status_code=303)
+
+
+@router.post("/{contact_id}/links/{link_id}/remove")
+async def remove_link(
+    contact_id: str, link_id: str,
+    db: AsyncSession = Depends(get_db),
+):
+    await db.execute(text(
+        "DELETE FROM contact_links WHERE contact_id = :cid AND link_id = :lid"
+    ), {"cid": contact_id, "lid": link_id})
+    return RedirectResponse(url=f"/contacts/{contact_id}", status_code=303)
+
+
 @router.post("/reorder")
 async def reorder_contact(
     request: Request,