feat(cli): pic init scaffolds a new declarative project

Offline project scaffolding — the on-ramp to pull/plan/apply. Writes a
`picloud.toml` describing a minimal *working* app (a `hello` endpoint
bound to GET /hello) plus commented examples for the other blocks,
`scripts/hello.rhai`, and a `.gitignore` that pre-ignores the project
tool's `.picloud/` link-state directory (the home for the bound-plan
state token, landing next). Refuses to overwrite an existing manifest
without `--force`; derives the app slug from the directory name when not
given (validated against the canonical slug rule).

The active manifest is rendered through the same `to_toml` model the rest
of the tool uses, so a freshly-init'd project is guaranteed valid and
immediately `pic plan`-able. Offline — no server contact, so the journey
tests need no DATABASE_URL.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/picloud-cli/src/main.rs

@@ -171,6 +171,11 @@ enum Cmd {
     /// (+ `scripts/<name>.rhai` sources) for declarative management with
     /// `pic plan` / `pic apply`.
     Pull(PullArgs),
+
+    /// Scaffold a new declarative project: a `picloud.toml` (minimal working
+    /// app), `scripts/hello.rhai`, and a `.gitignore`. Offline; deploy with
+    /// `pic plan` then `pic apply`.
+    Init(InitArgs),
 }
 
 #[derive(Args)]
@@ -204,6 +209,22 @@ struct PullArgs {
     dir: PathBuf,
 }
 
+#[derive(Args)]
+struct InitArgs {
+    /// App slug for the new project. Defaults to a slug derived from the
+    /// target directory's name.
+    slug: Option<String>,
+    /// Directory to scaffold into.
+    #[arg(long, default_value = ".")]
+    dir: PathBuf,
+    /// Display name for the app. Defaults to a title-cased slug.
+    #[arg(long)]
+    name: Option<String>,
+    /// Overwrite an existing `picloud.toml`.
+    #[arg(long)]
+    force: bool,
+}
+
 #[derive(Subcommand)]
 enum KvCmd {
     /// List keys in a collection.
@@ -1094,6 +1115,13 @@ async fn main() -> ExitCode {
         Cmd::Apply(args) => cmds::apply::run(&args.file, args.prune, args.yes, mode).await,
         Cmd::Plan(args) => cmds::plan::run(&args.file, mode).await,
         Cmd::Pull(args) => cmds::pull::run(&args.app, &args.dir, mode).await,
+        Cmd::Init(args) => cmds::init::run(
+            &args.dir,
+            args.slug.as_deref(),
+            args.name.as_deref(),
+            args.force,
+            mode,
+        ),
         Cmd::Apps { cmd: AppsCmd::Ls } => cmds::apps::ls(mode).await,
         Cmd::Apps {
             cmd: