feat: generic project UI, branding fix, context/artifact separation

Web:
- Replace GitHub-specific import with generic public Git URL import
- Update project workspace page to use ProjectView shape (name, sources)
- Migrate use-project-workspace hook to importPublicGit action
- Fix status key needsInput → needs-input

Branding:
- Correct Zopo/zopo → Zopu/zopu in docs/PRODUCT.md, docs/DESIGN.md, docs/TECH.md

Artifacts:
- Cut to 8 operational artifacts (removed project/business/design.md)
- Update artifact seeds with generic context scaffolding

docs/TECH.md

@@ -1,4 +1,4 @@
-# Zopo Work OS — Technical Architecture
+# Zopu Work OS — Technical Architecture
 
 > Working spec · engineering/platform/infra/security/agent teams · starts from an existing Better-T-Stack monorepo (web + Expo + shared packages).
 
@@ -107,7 +107,7 @@ Known first-party templates may run in lighter env; imported arbitrary repos def
 
 ```
 /  README.md, AGENTS.md, product.md, design.md, tech.md
-/.zopo/ project.yaml, services.yaml, policies.yaml
+/.zopu/ project.yaml, services.yaml, policies.yaml
         lifecycle/{setup,resume,verify,preview}  skills/{testing,reviewing,deploying}/SKILL.md
 /apps/
 ```