Implement shell completions for CLI (Workstream N-Completions)

Add `reviq completions bash/zsh` command with dynamic shell completions:

- Create bash-complete.ts entry point using stricli's proposeCompletions API
- Add completions command with bash and zsh support (fish planned)
- Extract app export to separate app.ts for shared imports
- Add @stricli/auto-complete dependency and __reviq_bash_complete bin entry

Also fix lint/type errors in api-server tests and helpers.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

bun.lock

@@ -44,10 +44,12 @@
       "version": "0.0.0",
       "bin": {
         "reviq": "./dist/index.js",
+        "__reviq_bash_complete": "./dist/bash-complete.js",
       },
       "dependencies": {
         "@noble/hashes": "^2.0.1",
         "@reviq/db": "workspace:*",
+        "@stricli/auto-complete": "^1.0.0",
         "@stricli/core": "^1.2.5",
       },
       "devDependencies": {
@@ -432,6 +434,8 @@
 
     "@standard-schema/spec": ["@standard-schema/spec@1.1.0", "", {}, "sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w=="],
 
+    "@stricli/auto-complete": ["@stricli/auto-complete@1.2.5", "", { "dependencies": { "@stricli/core": "^1.2.5" }, "bin": { "auto-complete": "dist/bin/cli.js" } }, "sha512-C6G88Hh4lUWBwiqsxbcA4I1ricSQwiLaOziTWW3NmBoX7WGTW7i7RvyooXMpZk1YMLf2olv5Odxmg127ik1DKQ=="],
+
     "@stricli/core": ["@stricli/core@1.2.5", "", {}, "sha512-+afyztQW7fwWkqmU2WQZbdc3LjnZThWYdtE0l+hykZ1Rvy7YGxZSvsVCS/wZ/2BNv117pQ9TU1GZZRIcPnB4tw=="],
 
     "@sveltejs/acorn-typescript": ["@sveltejs/acorn-typescript@1.0.8", "", { "peerDependencies": { "acorn": "^8.9.0" } }, "sha512-esgN+54+q0NjB0Y/4BomT9samII7jGwNy/2a3wNZbT2A2RpmXsXwUt24LvLhx6jUq2gVk4cWEvcRO6MFQbOfNA=="],