Fix deploy build failure and opencode chat execvp error

Add "gitea" to local RepoResult provider type (was missing from UI
interface despite being returned by repo-search). Copy opencode binary
instead of symlinking — symlink through /root/ is inaccessible to the
nextjs user due to directory permissions.

apps/harness/Dockerfile

@@ -42,8 +42,8 @@ RUN apk add --no-cache git github-cli curl ca-certificates
 RUN npm install -g @anthropic-ai/claude-code @openai/codex
 RUN curl -fsSL https://opencode.ai/install | sh || \
     echo "WARN: opencode install failed, skipping"
-# Ensure opencode is on PATH (installer puts it in ~/.local/bin)
-RUN if [ -f /root/.local/bin/opencode ]; then ln -s /root/.local/bin/opencode /usr/local/bin/opencode; fi
+# Ensure opencode is on PATH (installer puts it in ~/.local/bin which root owns)
+RUN if [ -f /root/.local/bin/opencode ]; then cp /root/.local/bin/opencode /usr/local/bin/opencode; fi
 
 # MCP servers: Gitea (Go binary from builder stage)
 COPY --from=gitea-mcp-builder /usr/local/bin/gitea-mcp /usr/local/bin/gitea-mcp

apps/harness/src/components/harness-dashboard.tsx

@@ -613,7 +613,7 @@ function NewTaskTab({ onSubmit, mobile, projects, knowledgeDocs }: {
 // ─── REPO SEARCH COMPONENT ────────────────────────────────────────────────────
 
 interface RepoResult {
-  provider: "github" | "gitlab";
+  provider: "github" | "gitlab" | "gitea";
   fullName: string;
   url: string;
   description: string;