fix: remove legacy config APIs

Remove stale ToolConfig and ConfigFolder backend/frontend surfaces after the ConfigProfile refactor. Drop dead routers, schemas, model exports, frontend routes, clients, pages, and tests; keep ToolType API compatibility for existing interface/is_builtin response shape.

Quality gates: backend LSP diagnostics passed; backend py_compile passed; backend ruff passed; frontend ToolWorkshopPage test passed. Frontend typecheck blocked by unrelated missing xterm-addon-serialize types.

apps/api/src/models/__init__.py

@@ -1,5 +1,4 @@
 from src.models.base import Base
-from src.models.config_folder import ConfigFolder
 from src.models.config_include import ConfigInclude
 from src.models.config_mount import ConfigMount
 from src.models.config_profile import ConfigProfile
@@ -13,7 +12,6 @@ from src.models.user_config import UserConfig
 
 __all__ = [
     "Base",
-    "ConfigFolder",
     "ConfigInclude",
     "ConfigMount",
     "ConfigProfile",

apps/api/src/models/config_folder.py

@@ -1,33 +0,0 @@
-import uuid
-from typing import TYPE_CHECKING
-
-from sqlalchemy import Boolean, ForeignKey, JSON, String, Text
-from sqlalchemy import Uuid as UUID
-from sqlalchemy.orm import Mapped, mapped_column, relationship
-
-from src.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
-
-if TYPE_CHECKING:
-    from src.models.user import User
-
-
-class ConfigFolder(UUIDPrimaryKeyMixin, TimestampMixin, Base):
-    __tablename__ = "config_folders"
-
-    user_id: Mapped[uuid.UUID] = mapped_column(
-        UUID(), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
-    )
-    name: Mapped[str] = mapped_column(String(255), nullable=False)
-    description: Mapped[str | None] = mapped_column(Text, nullable=True)
-    mount_path: Mapped[str] = mapped_column(String(1024), nullable=False)
-    files: Mapped[dict] = mapped_column(
-        JSON, default=dict, nullable=False
-    )  # {"relative/path": "content", ...}
-    project_overrides: Mapped[dict | None] = mapped_column(
-        JSON, default=dict, nullable=True
-    )  # {"project_id": {"mount_path": "...", "files": {...}}}
-    # DEPRECATED: Legacy auto-mounting flag. No longer used for launch-time
-    # auto-mounting. Use ConfigProfile and ToolInstance.selected_profile_id instead.
-    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
-
-    user: Mapped["User"] = relationship()

apps/api/src/models/tool_type.py

@@ -1,8 +1,7 @@
 import uuid
 from typing import TYPE_CHECKING
 
-from sqlalchemy import Boolean, ForeignKey, JSON, String, Text
-from sqlalchemy import Uuid as UUID
+from sqlalchemy import Boolean, ForeignKey, JSON, String, Text, Uuid as UUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from src.models.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
@@ -52,3 +51,21 @@ class ToolType(UUIDPrimaryKeyMixin, TimestampMixin, Base):
         foreign_keys=[manifest_id],
     )
     created_by: Mapped["User | None"] = relationship()
+
+    @property
+    def interfaces(self) -> list[str]:
+        """Backward-compatible API view for the single interface type."""
+        return [self.interface_type]
+
+    @interfaces.setter
+    def interfaces(self, value: list[str] | str) -> None:
+        """Accept legacy interface lists and store the first interface type."""
+        if isinstance(value, str):
+            self.interface_type = value
+            return
+        self.interface_type = value[0] if value else "web"
+
+    @property
+    def is_builtin(self) -> bool:
+        """Built-in tools are seeded system tools without a creating user."""
+        return self.created_by_id is None