feat: integrate Pi backend and Pi Web

config/README.md

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+# Managed profile defaults
+
+`settings.default.json` and `models.example.json` seed a new local profile.
+The launcher copies them into `data/agent/` only when the destination file is
+missing, so upgrades never overwrite a user's settings or model configuration.

config/models.example.json

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+{
+  "providers": {}
+}

config/settings.default.json

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+{}