feat(review,teams): review foundation — segments, side-by-side editor, rebuild, XLIFF, team workspaces

Foundations:
- TranslationSegment model + migration f7e8d9c0b1a2 (segments, workspaces,
  workspace_members, glossaries.workspace_id)
- SegmentRecorder injected into all 4 translators: unique (source,
  translation) pairs captured per job and persisted (best-effort)
- set_segment_overrides: human-reviewed translations applied verbatim on
  rebuild — top priority over TM and provider, zero API calls

Review API (routes/review_routes.py):
- GET /translations/{id}/segments (owner or job token)
- PATCH /segments/{id} edit/approve — feeds the per-user TM so approved
  translations are reused in later jobs
- POST /translations/{id}/rebuild — rebuild document with reviewed text
- GET/POST /translations/{id}/xliff — XLIFF 1.2 export/import (edited
  segments export their reviewed text)

Review editor (frontend /dashboard/reviews/[jobId]):
- side-by-side source/translation table, inline edit, approve (single or
  all), rebuild & download (auth blob), XLIFF export/import, 13 locales
- 'Relire et corriger' link on the translation-complete screen

Team workspaces (routes/workspace_routes.py + /dashboard/teams):
- Workspace/WorkspaceMember models, roles owner/admin/member
- create (Business plan), list with seat usage, invite by email with
  seat-limit enforcement (Business=5, Enterprise unlimited), removal
- shared glossaries: workspace members can use a glossary shared to their
  workspace (access check extended)

Tests: 1184 passed / 0 failed (11 new: recorder, overrides, docx
capture->rebuild e2e, XLIFF structure/escaping, seats, workspace CRUD,
shared glossary access)

translators/excel_translator.py

@@ -125,6 +125,18 @@ class ExcelTranslator:
             user_id, prompt or getattr(self, "_custom_prompt", None)
         )
 
+    def set_segment_recorder(self, recorder) -> None:
+        """Attach a segment recorder (review foundation)."""
+        self._segment_recorder = recorder
+
+    def set_segment_overrides(self, overrides) -> None:
+        """Human-reviewed translations applied verbatim on rebuild."""
+        self._segment_overrides = overrides or {}
+
+    def get_recorded_segments(self):
+        recorder = getattr(self, "_segment_recorder", None)
+        return recorder.get_pairs() if recorder is not None else []
+
 
     def translate_file(
         self,
@@ -461,12 +473,41 @@ class ExcelTranslator:
                     miss_texts, target_language, source_language
                 )
 
-        # Translation memory: reuse this user's previous translations
-        # (identical context/prompt) before hitting the provider.
-        translated = translate_with_tm(
-            texts, target_language, source_language,
-            provider_name, getattr(self, "_tm_scope", None), _do_translate,
+        from translators.segments import apply_overrides
+
+        # Reviewer overrides (approved/edited segments) win over everything:
+        # no TM lookup, no provider call, zero drift from the reviewed text.
+        ov_hits, ov_misses = apply_overrides(
+            texts, getattr(self, "_segment_overrides", None)
         )
+        miss_texts = [texts[i] for i in ov_misses]
+
+        if miss_texts:
+            # Translation memory: reuse this user's previous translations
+            # (identical context/prompt) before hitting the provider.
+            miss_translated = translate_with_tm(
+                miss_texts, target_language, source_language,
+                provider_name, getattr(self, "_tm_scope", None), _do_translate,
+            )
+        else:
+            miss_translated = []
+
+        translated = []
+        miss_pos = 0
+        for i in range(len(texts)):
+            if i in ov_hits:
+                translated.append(ov_hits[i])
+            else:
+                translated.append(
+                    miss_translated[miss_pos]
+                    if miss_pos < len(miss_translated)
+                    else texts[i]
+                )
+                miss_pos += 1
+
+        recorder = getattr(self, "_segment_recorder", None)
+        if recorder is not None:
+            recorder.record_pairs(zip(texts, translated))
 
         changed = sum(1 for orig, trans in zip(texts, translated) if orig != trans and trans.strip())
         self._translation_stats["changed"] += changed