chore: add LGPL-3.0-or-later license and update package.json licenses

- Add LICENSE file to root and cli/ directories with LGPL-3.0-or-later text
- Create cli/NOTICE file with MIT attribution for happy-cli derived code
- Update license field in cli/, server/, and web/ package.json to "LGPL-3.0-or-later"
- Add NOTICE to cli/package.json files array for npm publishing

cli/NOTICE

@@ -0,0 +1,52 @@
+hapi CLI
+Copyright (c) 2024-2025 weishu
+
+This software contains code derived from happy-cli
+(https://github.com/slopus/happy-cli), which is licensed
+under the MIT License:
+
+---
+
+MIT License
+
+Copyright (c) 2024 Kirill Dubovitskiy
+
+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.
+
+---
+
+The following files/directories are derived from happy-cli:
+- src/api/
+- src/claude/
+- src/codex/
+- src/daemon/
+- src/commands/
+- src/ui/
+- src/utils/
+- src/modules/ripgrep/
+- src/modules/difftastic/
+- src/modules/watcher/
+- src/modules/common/registerCommonHandlers.ts
+- src/modules/common/pathSecurity.ts
+- src/parsers/
+- src/configuration.ts
+- src/persistence.ts
+- src/projectPath.ts
+- src/lib.ts
+- src/index.ts