docs: add ttyd dual-interface plan to TUI roadmap

Plan to expose both OpenCode IDE (port 8080) and raw ttyd terminal
(port 7681) for direct TUI access in browser.

ROADMAP.md

@@ -48,24 +48,36 @@
 
 **Goal**: Enable rich terminal UI applications (like htop, lazygit, OpenCode TUI mode) to render correctly in the browser-based terminal.
 
-**Completed**:
+**Completed** (Terminal Environment):
 - [x] TERM=xterm-256color environment variable
 - [x] COLORTERM=truecolor for 24-bit color support
 - [x] ncurses-base and ncurses-term packages for terminfo database
 - [x] Locale configuration (en_US.UTF-8) for Unicode support
 - [x] Environment variables passed to deployed stacks
 
-**Remaining**:
-- [ ] Test TUI applications in browser (htop, lazygit, vim)
-- [ ] Verify mouse event passthrough works
-- [ ] Test box-drawing character rendering
+**Remaining** (Direct Web Terminal):
+- [ ] Add ttyd for raw terminal access in browser
+- [ ] Configure dual-port exposure (OpenCode IDE + ttyd terminal)
+- [ ] Update Traefik routing for terminal port
+- [ ] Test TUI applications (htop, lazygit, vim)
 - [ ] Document TUI capabilities for users
 
-**Technical Notes**:
-- OpenCode uses built-in xterm.js web terminal
-- Terminal environment configured in Docker image + deployer
-- 256 colors verified working (tput colors = 256)
-- 104 xterm terminfo entries installed
+**Architecture** (Dual Interface):
+```
+https://name.ai.flexinit.nl/      → Port 8080 → OpenCode Web IDE
+https://name.ai.flexinit.nl:7681/ → Port 7681 → ttyd Raw Terminal
+```
+
+**Implementation Plan**:
+```dockerfile
+# Add ttyd to Dockerfile
+RUN curl -sL https://github.com/tsl0922/ttyd/releases/latest/download/ttyd.x86_64 \
+    -o /usr/local/bin/ttyd && chmod +x /usr/local/bin/ttyd
+
+# Startup script runs both services
+ttyd -p 7681 -W bash &
+opencode serve --hostname 0.0.0.0 --port 8080
+```
 
 **Use Cases**:
 - OpenCode TUI mode in browser