fix(10): resolve GET /source-config 404 shadowed by :id route

The admin source-config settings form failed to load with "Failed to
fetch tender-radar source config". Network trace showed
GET /modules/tender-radar/source-config returning 404.

Root cause: NestJS RouterExplorer maps routes in method-declaration
order. `@Get(':id')` was declared before `@Get('source-config')`, so
the param route captured "source-config" as an id and shadowed the
static handler (401 unauthenticated, 404 past the guard — no Tender
with id "source-config").

Fix: declare `@Get('source-config')` before `@Get(':id')`. Add a
declaration-order regression test — unit tests call controller methods
directly, bypass routing, and could never catch route shadowing.

Verified live: settings form now loads real config, interval save
persists and live-re-registers the scheduler (INGEST-06). Phase 10
verification raised human_needed -> passed after full browser UAT.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/api/src/tenders/tenders.controller.ts

@@ -70,6 +70,26 @@ export class TendersController {
     return { items, total, page, limit };
   }
 
+  /**
+   * GET /modules/tender-radar/source-config — read the singleton
+   * doe-opendata poll config.
+   *
+   * MUST be declared before the `:id` route below — NestJS matches routes
+   * in declaration order, so a `@Get(':id')` placed first would capture
+   * "source-config" as an id and shadow this handler (404 on GET).
+   */
+  @Get('source-config')
+  @Roles(Role.ADMIN, Role.SUPER_ADMIN)
+  async getSourceConfig() {
+    const config = await this.prisma.tenderSourcePollConfig.findUnique({
+      where: { sourceType: DOE_SOURCE_TYPE },
+    });
+    if (!config) {
+      throw new NotFoundException('Tender source config not yet seeded');
+    }
+    return config;
+  }
+
   /**
    * GET /modules/tender-radar/:id — single tender detail.
    * Gated by @UseModule('tender-radar'); NOT scoped by the tenant's id
@@ -86,22 +106,8 @@ export class TendersController {
   }
 
   // ─── Admin source-config (Roles-guarded, live scheduler apply) ────────────
-
-  /**
-   * GET /modules/tender-radar/source-config — read the singleton
-   * doe-opendata poll config.
-   */
-  @Get('source-config')
-  @Roles(Role.ADMIN, Role.SUPER_ADMIN)
-  async getSourceConfig() {
-    const config = await this.prisma.tenderSourcePollConfig.findUnique({
-      where: { sourceType: DOE_SOURCE_TYPE },
-    });
-    if (!config) {
-      throw new NotFoundException('Tender source config not yet seeded');
-    }
-    return config;
-  }
+  // NOTE: GET /source-config is declared above the `:id` route (route-order
+  // matters in NestJS). The PUT below is not shadowed — there is no @Put(':id').
 
   /**
    * PUT /modules/tender-radar/source-config — upsert the singleton