fix: WASM import path respects __WZP_BASE_URL for cross-origin loading

When variant JS is loaded from featherChat (different origin), WASM
imports need to resolve via the /audio/ Caddy path, not root /.
All 4 variant files now use: (window.__WZP_BASE_URL || '') + '/wasm/...'

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-web/static/js/wzp-full.js

@@ -15,7 +15,7 @@
 
 'use strict';
 
-const WZP_WASM_PATH = '/wasm/wzp_wasm.js';
+const WZP_WASM_PATH = (window.__WZP_BASE_URL || '') + '/wasm/wzp_wasm.js';
 
 // 12-byte MediaHeader size (matches wzp-proto MediaHeader::WIRE_SIZE).
 const MEDIA_HEADER_SIZE = 12;

crates/wzp-web/static/js/wzp-hybrid.js

@@ -10,7 +10,7 @@
 'use strict';
 
 // WASM module path (served from /wasm/ by the wzp-web bridge).
-const WZP_WASM_PATH = '/wasm/wzp_wasm.js';
+const WZP_WASM_PATH = (window.__WZP_BASE_URL || '') + '/wasm/wzp_wasm.js';
 
 class WZPHybridClient {
   /**

crates/wzp-web/static/js/wzp-ws-fec.js

@@ -7,7 +7,7 @@
 'use strict';
 
 // WASM module path (served from /wasm/ by the wzp-web bridge).
-const WZP_WS_FEC_WASM_PATH = '/wasm/wzp_wasm.js';
+const WZP_WS_FEC_WASM_PATH = (window.__WZP_BASE_URL || '') + '/wasm/wzp_wasm.js';
 
 // 12-byte MediaHeader size (matches wzp-proto MediaHeader::WIRE_SIZE).
 const WZP_WS_FEC_HEADER_SIZE = 12;

crates/wzp-web/static/js/wzp-ws-full.js

@@ -7,7 +7,7 @@
 'use strict';
 
 // WASM module path (served from /wasm/ by the wzp-web bridge).
-const WZP_WS_FULL_WASM_PATH = '/wasm/wzp_wasm.js';
+const WZP_WS_FULL_WASM_PATH = (window.__WZP_BASE_URL || '') + '/wasm/wzp_wasm.js';
 
 // 12-byte MediaHeader size (matches wzp-proto MediaHeader::WIRE_SIZE).
 const WZP_WS_FULL_HEADER_SIZE = 12;