initial agent-mgr: app builder platform MVP

Go API server + Preact UI + Claude Code adapter.
- App-centric model (ideas, not repos)
- AgentProvider interface for multi-agent support
- K8s pod lifecycle for sandboxed agent sessions
- Gitea integration (create repos, push branches)
- WebSocket streaming for live session output
- Woodpecker CI/CD pipelines (kaniko build + kubectl deploy)

.woodpecker/build.yaml

@@ -0,0 +1,38 @@
+variables:
+  - &kaniko_settings
+    registry: git.asp.now
+    username:
+      from_secret: gitea_user
+    password:
+      from_secret: gitea_token
+
+when:
+  - event: [push, tag]
+    branch: main
+
+steps:
+  - name: build-agent-mgr
+    image: woodpeckerci/plugin-kaniko
+    settings:
+      <<: *kaniko_settings
+      repo: git.asp.now/platform/agent-mgr
+      tags:
+        - latest
+        - ${CI_COMMIT_SHA:0:8}
+      dockerfile: docker/Dockerfile
+      context: .
+      cache: true
+      cache_repo: git.asp.now/platform/agent-mgr/cache
+
+  - name: build-claude-runner
+    image: woodpeckerci/plugin-kaniko
+    settings:
+      <<: *kaniko_settings
+      repo: git.asp.now/platform/claude-code-runner
+      tags:
+        - latest
+        - ${CI_COMMIT_SHA:0:8}
+      dockerfile: docker/Dockerfile.claude-runner
+      context: docker/
+      cache: true
+      cache_repo: git.asp.now/platform/claude-code-runner/cache