test(e2e): fix remaining server config and mcp image failures

Follow-up to the first e2e fix: with nanoid/editRes.edits resolved, the
suites failed one layer deeper. Both layers were never green since the
e2e jobs were added (non-blocking in CI), so the failures had stacked up.

server e2e (jest-e2e.json) — align module resolution/transform with the
working unit/integration jest configs so AppModule's full import graph
loads:
- moduleFileExtensions: add "tsx" (React-Email .tsx templates are pulled
  in via the auth controller chain).
- transform: ^.+\.(t|j)s$ -> ^.+\.(t|j)sx?$ so .tsx is transformed.
- moduleNameMapper: add ^src/(.*)$ -> <rootDir>/../src/$1 (code imports
  via the absolute 'src/...' alias). Verified locally: the module graph
  now fully resolves (only env vars, supplied by CI, remain).

mcp e2e (test-e2e.mjs) — insert_image/replace_image accept only http(s)
URLs the server fetches; the test passed local file paths and died with
"Invalid image URL". Serve the PNG bytes over a throwaway 127.0.0.1 HTTP
server (the Docmost server runs on the same CI host) and pass URLs. The
featPng negative test is untouched: replaceImage checks the attachmentId
and throws before fetching, so its local path is never validated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/test/jest-e2e.json

@@ -1,10 +1,10 @@
 {
-  "moduleFileExtensions": ["js", "json", "ts"],
+  "moduleFileExtensions": ["js", "json", "ts", "tsx"],
   "rootDir": ".",
   "testEnvironment": "node",
   "testRegex": ".e2e-spec.ts$",
   "transform": {
-    "^.+\\.(t|j)s$": "ts-jest"
+    "^.+\\.(t|j)sx?$": "ts-jest"
   },
   "transformIgnorePatterns": [
     "/node_modules/(?!(\\.pnpm/)?(nanoid|uuid|image-dimensions|marked|happy-dom|lib0)(@|/))"
@@ -12,6 +12,7 @@
   "moduleNameMapper": {
     "^@docmost/db/(.*)$": "<rootDir>/../src/database/$1",
     "^@docmost/transactional/(.*)$": "<rootDir>/../src/integrations/transactional/$1",
-    "^@docmost/ee/(.*)$": "<rootDir>/../src/ee/$1"
+    "^@docmost/ee/(.*)$": "<rootDir>/../src/ee/$1",
+    "^src/(.*)$": "<rootDir>/../src/$1"
   }
 }