feat: Tool Workshop manifest editor (PR 2)

- Add tool_definitions API client with types for manifests
- Add ManifestEditor component: base image selector, package editors
  (apt/npm/pip/node), script editors (build/startup), mount schema
  designer, runtime config, and live preview panel
- Integrate ManifestEditor into Tool Workshop as 'Manifest (Declarative)'
  definition type alongside Compose and Dockerfile
- Update ToolType API types to include manifest_id and 'manifest'
  definition_type
- Frontend builds clean, TypeScript typecheck passes

apps/api/alembic/versions/2026_05_28_add_tool_definition_manifests.py

@@ -94,7 +94,9 @@ def upgrade() -> None:
         op.drop_constraint("chk_definition_type", "tool_types", type_="check")
 
     op.execute("ALTER TABLE tool_types ALTER COLUMN definition_type TYPE VARCHAR(16)")
-    op.execute("ALTER TABLE tool_types ALTER COLUMN definition_type SET DEFAULT 'legacy'")
+    op.execute(
+        "ALTER TABLE tool_types ALTER COLUMN definition_type SET DEFAULT 'legacy'"
+    )
 
     # ── Add columns to tool_instances ────────────────────────────────
     result = conn.execute(
@@ -106,7 +108,9 @@ def upgrade() -> None:
     if not result.fetchone():
         op.add_column(
             "tool_instances",
-            sa.Column("manifest_compiled_at", sa.TIMESTAMP(timezone=True), nullable=True),
+            sa.Column(
+                "manifest_compiled_at", sa.TIMESTAMP(timezone=True), nullable=True
+            ),
         )
 
     result = conn.execute(
@@ -369,7 +373,9 @@ CMD ["/bin/bash"]
         op.drop_column("tool_instances", "manifest_compiled_at")
 
     if has_manifest_id:
-        op.drop_constraint("fk_tool_types_manifest_id", "tool_types", type_="foreignkey")
+        op.drop_constraint(
+            "fk_tool_types_manifest_id", "tool_types", type_="foreignkey"
+        )
         op.drop_column("tool_types", "manifest_id")
 
     op.drop_table("tool_definition_manifests")