refactor: restructure bastion as pnpm monorepo (@lab/shared, @lab/bastion, @lab/cli)

- Split into 3 workspace packages: shared (types/constants), bastion (server), cli
- CLI binary renamed from "bastion" to "lab"
- Cross-package imports via @lab/shared and @lab/bastion workspace references
- Extracted BastionConfig, BastionState, HardwareInfo types into @lab/shared
- Added APP_NAME/APP_VERSION constants
- tsconfig.base.json with project references for build ordering
- Root workspace scripts: build, test, typecheck, clean

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bastion/pnpm-lock.yaml

@@ -7,22 +7,6 @@ settings:
 importers:
 
   .:
-    dependencies:
-      '@fastify/static':
-        specifier: ^8.0.0
-        version: 8.3.0
-      commander:
-        specifier: ^13.0.0
-        version: 13.1.0
-      execa:
-        specifier: ^9.5.0
-        version: 9.6.1
-      fastify:
-        specifier: ^5.0.0
-        version: 5.8.2
-      winston:
-        specifier: ^3.17.0
-        version: 3.19.0
     devDependencies:
       '@types/node':
         specifier: ^22.10.0
@@ -40,6 +24,46 @@ importers:
         specifier: ^3.0.0
         version: 3.2.4(@types/node@22.19.15)(tsx@4.21.0)
 
+  src/bastion:
+    dependencies:
+      '@fastify/static':
+        specifier: ^8.0.0
+        version: 8.3.0
+      '@lab/shared':
+        specifier: workspace:*
+        version: link:../shared
+      execa:
+        specifier: ^9.5.0
+        version: 9.6.1
+      fastify:
+        specifier: ^5.0.0
+        version: 5.8.2
+      winston:
+        specifier: ^3.17.0
+        version: 3.19.0
+    devDependencies:
+      '@types/node':
+        specifier: ^22.10.0
+        version: 22.19.15
+
+  src/cli:
+    dependencies:
+      '@lab/bastion':
+        specifier: workspace:*
+        version: link:../bastion
+      '@lab/shared':
+        specifier: workspace:*
+        version: link:../shared
+      commander:
+        specifier: ^13.0.0
+        version: 13.1.0
+    devDependencies:
+      '@types/node':
+        specifier: ^22.10.0
+        version: 22.19.15
+
+  src/shared: {}
+
 packages:
 
   '@colors/colors@1.6.0':