Prepare TunnelX for open-source release

docs/BUILD.md

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+# Build and Release
+
+## Local Build
+
+```powershell
+dotnet build AppTunnel.sln -c Release
+```
+
+## Standalone Compressed EXE
+
+```powershell
+dotnet publish AppTunnel\AppTunnel.csproj -c Release -r win-x64 --self-contained true -p:PublishSingleFile=true -p:EnableCompressionInSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true -p:DebugType=None -p:DebugSymbols=false -o publish\TunnelX-standalone-compressed-exe
+```
+
+Rename the final executable with the app version:
+
+```powershell
+TunnelX-v1.2.21-standalone-compressed.exe
+```
+
+## Before Publishing
+
+- Run the leak test plan in `docs/PUBLISHING_CHECKLIST.md`.
+- Confirm third-party license notices are current.
+- Confirm the app version in `AppTunnel/AppTunnel.csproj`.
+- Attach release artifacts only to GitHub Releases; do not commit generated `publish/` or `Releases/` output.

docs/DONATE.md

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+# Donate
+
+TunnelX is free and open-source. Donations are optional.
+
+## PayPal
+
+- PayPal email: `gallafan@gmail.com`
+- Donation link: https://www.paypal.com/donate/?business=gallafan%40gmail.com&currency_code=USD
+
+If you do not want your personal PayPal identity to be associated with the project, use a project-specific PayPal account before the first public release.
+
+## Crypto Wallets
+
+| Network / Asset | Address |
+| --- | --- |
+| TRON / USDT-TRC20 / TRX | `TNWV867fQDT6zpLunHgbeMjrN6ic63LQSu` |
+| Bitcoin | `bc1qgx3g47c458fu6smnpqpu0l05hha82rq2xjet4y` |
+| Ethereum / USDT-ERC20 | `0x72d94Bb250E8802441a0ED05686Ee925BC99Fef5` |
+| TON | `UQD65oL2Vu2OJDSrwQ0wLLSw3g668SREMJ3VPW9k8b6Sy-Yf` |
+| BNB Smart Chain | `0xE2a5b01cE2b3713D435Bc16d92eAdd88A82159f0` |
+| Dogecoin | `DSZRNY65yF679uvjAh6sUAt6YiEEQHwKGb` |
+
+Always verify the network before sending funds. Sending assets to the wrong network can permanently lose the donation.
+
+Blockchain donations are public. These wallet addresses should ideally be project-specific wallets, not personal long-term wallets, if contributor privacy matters.

docs/LEGAL.md

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+# Legal and Compliance Notes
+
+TunnelX is published as free/open-source software by MaxFan.
+
+## Project License
+
+The project is marked as `GPL-3.0-or-later` to stay compatible with bundled GPL components, especially sing-box. If the release packaging changes and no GPL binary is bundled, the maintainer can revisit the license choice.
+
+## Third-Party Components
+
+Review `THIRD_PARTY_NOTICES.md` before every public release. Native binaries and data files must keep their upstream license notices.
+
+## Usage
+
+TunnelX is a network routing, VPN, proxy, and packet interception tool. Users are responsible for complying with their local rules, workplace policies, network policies, and service terms.
+
+## No Warranty
+
+TunnelX is provided without warranty. It can change routes, DNS behavior, local proxy behavior, and packet handling, so users should test carefully before relying on it.
+
+This document is not legal advice.

docs/PRIVACY.md

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+# Privacy
+
+TunnelX is designed as a local desktop app.
+
+## Data Stored Locally
+
+The app may store profiles, selected apps, include/exclude destinations, connection history, and logs on the user's Windows machine, typically under `%LOCALAPPDATA%\TunnelX` or the app directory depending on the feature.
+
+## Network Data
+
+TunnelX handles local routing and packet metadata to decide what should use the tunnel. It does not intentionally send analytics or telemetry to the maintainer.
+
+## Logs
+
+Logs can contain hostnames, IP addresses, process names, ports, and connection state. Users should sanitize logs before posting them publicly.
+
+## Donations
+
+Donation links open external services such as PayPal. Those services have their own privacy policies.
+
+Crypto wallet addresses are public receiving addresses. On-chain transactions may be publicly visible and can connect the project identity with wallet activity. For stronger maintainer privacy, use wallets created specifically for TunnelX.