refactor: Plan 22+23 — mod.rs eliminiert, Dependencies workspace-weit, Clippy clean

Plan 22: Alle 5 mod.rs durch moderne {modul}.rs Convention ersetzt
- raijin-call/src/call_impl, raijin-eval/src/examples,
  raijin-keymap-editor/src/ui_components, raijin-agent/src/tests,
  raijin-repl/src/kernels

Plan 23: ~98 hartcodierte Dependency-Versionen auf workspace = true migriert
- Root Cargo.toml in 16 logische Sektionen strukturiert
- Fehlende Dependencies zum Workspace hinzugefügt (tree-sitter grammars,
  platform deps, AWS, collab, audio, terminal)
- Version-Upgrades: strum 0.26→0.27, mach2 0.4→0.5, notify 7→8
- rust-embed auf 8.7.2 vereinheitlicht
- Verbleibende Ausnahmen dokumentiert: unicode-width (package rename),
  prost 0.14 (raijin-denoise), ropey v1 (raijin-app)

Zusätzliche Fixes:
- lsp-types proposed Feature für alle Crates die es brauchen
- ClientCapabilities offset_encoding Feld ergänzt
- url::Url::scheme() API-Change (gibt &str statt Option)
- PackageChipConfig mit display_private (wie Starship)
- 168 Clippy-Warnings behoben (useless_conversion, collapsible_if,
  let_underscore_future, nonminimal_bool, needless_update, u.a.)

cargo check --workspace: 0 errors
cargo clippy --workspace: 0 errors, 0 warnings

Author: nyxb

Cargo.lock

@@ -56,6 +56,9 @@ pub struct ChipSettingsContent {
 
     /// Python provider configuration.
     pub python: Option<PythonChipContent>,
+
+    /// Package provider configuration.
+    pub package: Option<PackageChipContent>,
 }
 
 /// Per-chip configuration override.
@@ -213,3 +216,18 @@ pub struct PythonChipContent {
     /// Default: false
     pub pyenv_version_name: Option<bool>,
 }
+
+/// Package chip configuration.
+///
+/// ```toml
+/// [chip.package]
+/// display_private = false
+/// ```
+#[with_fallible_options]
+#[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize, JsonSchema, MergeFrom)]
+pub struct PackageChipContent {
+    /// Show version for private packages (package.json `"private": true`).
+    ///
+    /// Default: false
+    pub display_private: Option<bool>,
+}