re-arrange (#3123)

core/CLAUDE.md

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+# Core — Rust Backend
+
+The Rust backend daemon for StartOS.
+
+## Binaries
+
+- `startbox` — Main daemon (runs as `startd`)
+- `start-cli` — CLI interface
+- `start-container` — Runs inside LXC containers; communicates with host and manages subcontainers
+- `registrybox` — Registry daemon
+- `tunnelbox` — VPN/tunnel daemon
+
+## Key Modules
+
+- `src/context/` — Context types (RpcContext, CliContext, InitContext, DiagnosticContext)
+- `src/service/` — Service lifecycle management with actor pattern (`service_actor.rs`)
+- `src/db/model/` — Patch-DB models (`public.rs` synced to frontend, `private.rs` backend-only)
+- `src/net/` — Networking (DNS, ACME, WiFi, Tor via Arti, WireGuard)
+- `src/s9pk/` — S9PK package format (merkle archive)
+- `src/registry/` — Package registry management
+
+## RPC Pattern
+
+See `rpc-toolkit.md` for JSON-RPC handler patterns and configuration.
+
+## Patch-DB Patterns
+
+Patch-DB provides diff-based state synchronization. Changes to `db/model/public.rs` automatically sync to the frontend.
+
+**Key patterns:**
+- `db.peek().await` — Get a read-only snapshot of the database state
+- `db.mutate(|db| { ... }).await` — Apply mutations atomically, returns `MutateResult`
+- `#[derive(HasModel)]` — Derive macro for types stored in the database, generates typed accessors
+
+**Generated accessor types** (from `HasModel` derive):
+- `as_field()` — Immutable reference: `&Model<T>`
+- `as_field_mut()` — Mutable reference: `&mut Model<T>`
+- `into_field()` — Owned value: `Model<T>`
+
+**`Model<T>` APIs** (from `db/prelude.rs`):
+- `.de()` — Deserialize to `T`
+- `.ser(&value)` — Serialize from `T`
+- `.mutate(|v| ...)` — Deserialize, mutate, reserialize
+- For maps: `.keys()`, `.as_idx(&key)`, `.as_idx_mut(&key)`, `.insert()`, `.remove()`, `.contains_key()`
+
+## i18n
+
+See `i18n-patterns.md` for internationalization key conventions and the `t!()` macro.
+
+## Rust Utilities & Patterns
+
+See `core-rust-patterns.md` for common utilities (Invoke trait, Guard pattern, mount guards, Apply trait, etc.).