refactor(opencode): rename service directory from opencode-web to opencode

opencode/.env.example

@@ -0,0 +1,17 @@
+# Copy to .env and fill in. Never commit .env.
+#
+#   cp .env.example .env
+
+# Web UI and API login password. MUST NOT be blank -- opencode serves the web
+# interface, and with it a shell on this container, to anyone when
+# OPENCODE_SERVER_PASSWORD is unset.
+# Generate one with: openssl rand -base64 24
+OPENCODE_SERVER_PASSWORD=
+
+# Username to pair with it. opencode defaults to `opencode` when unset.
+OPENCODE_SERVER_USERNAME=opencode
+
+# Git identity for the commits the agent makes, as author and committer. git
+# reads these directly, so no `git config` step is needed.
+GIT_NAME=
+GIT_EMAIL=