feat(pm): add --from pnpm migration for install command

Reads pnpm-workspace.yaml and converts to utoo config:
- workspaces/overrides → package.json
- catalog/catalogs → .utoo.toml (merged with existing config via
  PNPM_MIGRATE_KEYS whitelist)

Migration runs before init_registry so MERGED_CONFIG picks up the
generated .utoo.toml for catalog: protocol resolution.

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

Author: elrrrrrrr

.github/workflows/pm-ci.yml

@@ -109,7 +109,6 @@ jobs:
 
       - name: Install dependencies
         run: utoo install
-        continue-on-error: true
 
       - name: Setup node x86
         uses: actions/setup-node@v4

Cargo.lock

@@ -59,6 +59,7 @@ tempfile                          = "3"
 thiserror                         = "1.0"
 tokio                             = { version = "1.47.1" }
 tokio-fs-ext                      = "0.7.8"
+serde_yaml                        = "0.9"
 toml                              = "0.8"
 tracing                           = "0.1.41"
 tracing-subscriber                = { version = "0.3.19", features = ["env-filter", "fmt"] }

Cargo.toml

@@ -47,6 +47,7 @@ reqwest            = { version = "0.12", default-features = false, features = [
 ] }
 serde              = { workspace = true }
 serde_json         = { version = "1.0", features = ["preserve_order"] }
+serde_yaml         = { workspace = true }
 sha1               = { workspace = true }
 sha2               = { workspace = true }
 tar                = "0.4"