chore: apply cargo fmt across workspace and update docs

- Run cargo fmt on all Rust crates for consistent formatting
- Update CLAUDE.md with WASM plugin commands and dev.ps1 instructions
- Update wiki: add WASM plugin architecture, rewrite dev environment docs
- Minor frontend cleanup (unused imports)

crates/erp-server/migration/src/m20260412_000022_create_process_variables.rs

@@ -18,7 +18,11 @@ impl MigrationTrait for Migration {
                             .primary_key(),
                     )
                     .col(ColumnDef::new(ProcessVariables::TenantId).uuid().not_null())
-                    .col(ColumnDef::new(ProcessVariables::InstanceId).uuid().not_null())
+                    .col(
+                        ColumnDef::new(ProcessVariables::InstanceId)
+                            .uuid()
+                            .not_null(),
+                    )
                     .col(ColumnDef::new(ProcessVariables::Name).string().not_null())
                     .col(
                         ColumnDef::new(ProcessVariables::VarType)
@@ -27,8 +31,16 @@ impl MigrationTrait for Migration {
                             .default("string"),
                     )
                     .col(ColumnDef::new(ProcessVariables::ValueString).text().null())
-                    .col(ColumnDef::new(ProcessVariables::ValueNumber).double().null())
-                    .col(ColumnDef::new(ProcessVariables::ValueBoolean).boolean().null())
+                    .col(
+                        ColumnDef::new(ProcessVariables::ValueNumber)
+                            .double()
+                            .null(),
+                    )
+                    .col(
+                        ColumnDef::new(ProcessVariables::ValueBoolean)
+                            .boolean()
+                            .null(),
+                    )
                     .col(
                         ColumnDef::new(ProcessVariables::ValueDate)
                             .timestamp_with_time_zone()