fix: resolve scie build FileNotFoundError for gateway in TUI installer (#10420)

Co-authored-by: Sion Kang <siontama@gmail.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: 3 people

changes/10420.fix.md

@@ -0,0 +1 @@
+Resolve `FileNotFoundError` for gateway config in TUI installer by adding symlink to `gateway.config.ts` and fixing duplicate debug field in webserver template

src/ai/backend/install/BUILD

@@ -86,6 +86,7 @@ resources(
         "configs/**/*.toml",
         "configs/**/*.yaml",
         "configs/**/*.json",
+        "configs/**/*.ts",
         "fixtures/**/*.json",
     ],
 )

src/ai/backend/install/configs/gateway.config.ts

@@ -0,0 +1 @@
+../../../../../configs/graphql/gateway.config.ts

src/ai/backend/install/context.py

@@ -354,17 +354,15 @@ def _write_supergraph() -> None:
         self.log_header(f"Wrote supergraph schema to {output_path}")
 
         base_path = self.install_info.base_path
-        project_root = Path(__file__).resolve().parents[4]
 
-        src_gateway = project_root / "configs/graphql/gateway.config.ts"
-        dst_gateway = base_path / "gateway.config.ts"
-        shutil.copy2(src_gateway, dst_gateway)
-        self.log_header(f"Copied {src_gateway} -> {dst_gateway}")
+        with self.resource_path("ai.backend.install.configs", "gateway.config.ts") as src_gateway:
+            dst_gateway = base_path / "gateway.config.ts"
+            shutil.copy(src_gateway, dst_gateway)
+            self.log_header(f"Copied gateway.config.ts -> {dst_gateway}")
 
-        src_supergraph = project_root / "docs/manager/graphql-reference/supergraph.graphql"
         dst_supergraph = base_path / "supergraph.graphql"
-        shutil.copy2(src_supergraph, dst_supergraph)
-        self.log_header(f"Copied {src_supergraph} -> {dst_supergraph}")
+        shutil.copy(Path(output_path), dst_supergraph)
+        self.log_header(f"Copied supergraph.graphql -> {dst_supergraph}")
 
         dst_compose_path = self.copy_config("docker-compose.yml")
         self.copy_config("prometheus.yaml")