Licences: MIT for the AES67 core and web page, GPL-3.0 for the rest

- LICENSE (GPL-3.0) at the root; an MIT LICENSE in each components/aes67_*
  and in web/, so they travel with the code when reused.
- THIRD_PARTY.md: third-party code and licences, and the known conflict of
  the Espressif binary audio libraries with GPL-3.0 (firmware contains cspot).
- CLAUDE.md: rule to keep GPL code out of the core; phase 2 item to replace
  the Espressif binaries (opencore-aacdec, Speex resampler).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Ben Nicholson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

web/index.html

@@ -5,6 +5,7 @@
 <meta name="viewport" content="width=device-width,initial-scale=1">
 <title>AES67 device</title>
 <!--
+  SPDX-License-Identifier: MIT (see web/LICENSE)
   AES67 device web UI – reusable base.
   CORE  : status, PTP, AES67 output, network/VLAN, logging, SDP. Keep identical across projects.
   PROJECT: blocks between "PROJECT START/END" markers (HTML and the PROJECT object in the script).