feat: file upload + expense report creation from Discuss attachments

- Discuss bot now reads ir.attachment from incoming messages; file-only
  messages no longer silently dropped
- ZIP files are described (contents listed) and bot asks clarifying
  question before acting; user's follow-up reply looks back for pending
  attachments so files don't need to be re-uploaded
- receipt_parser: extracts text from ZIP (recursive), JPG/PNG/etc (OCR),
  PDF (pdfplumber), HTML, TXT
- expenses_agent: full rewrite fixing broken method signatures; adds
  create_expense_sheet / create_expense / attach_receipt flow driven by
  LLM receipt parsing (Ollama, HIPAA-locked)
- master_agent: extra_context threads receipts + user_id into directives
- FastAPI /upload multipart endpoint; registered in main.py
- Odoo /ai/upload controller proxies files to agent service
- ab_ai_bot: dispatch_message_with_files() for multipart uploads

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent_service/tools/expenses_tools.py

@@ -84,3 +84,64 @@ class ExpensesTools:
     async def post_chatter_note(self, model: str, record_id: int, note: str) -> bool:
         await self._o.call(model, 'message_post', [[record_id]], {'body': note, 'message_type': 'comment'})
         return True
+
+    async def get_employee_id_for_user(self, user_id) -> int | None:
+        if not user_id:
+            return None
+        try:
+            records = await self._o.search_read(
+                'hr.employee', [('user_id', '=', int(user_id))], ['id', 'name'], limit=1)
+            return records[0]['id'] if records else None
+        except Exception as exc:
+            logger.warning('get_employee_id_for_user failed user_id=%s: %s', user_id, exc)
+            return None
+
+    async def get_default_expense_product(self) -> int | None:
+        try:
+            records = await self._o.search_read(
+                'product.product',
+                [('can_be_expensed', '=', True), ('type', '=', 'service')],
+                ['id', 'name'], limit=1)
+            return records[0]['id'] if records else None
+        except Exception as exc:
+            logger.warning('get_default_expense_product failed: %s', exc)
+            return None
+
+    async def create_expense_sheet(self, name: str, employee_id: int):
+        return await self._o.create('hr.expense.sheet', {
+            'name': name,
+            'employee_id': employee_id,
+        })
+
+    async def create_expense(self, sheet_id: int, employee_id: int, name: str,
+                              total_amount: float, date: str, product_id: int = None,
+                              description: str = ''):
+        vals: dict = {
+            'name': name,
+            'employee_id': employee_id,
+            'sheet_id': sheet_id,
+            'total_amount': total_amount,
+            'quantity': 1.0,
+        }
+        if date:
+            vals['date'] = date
+        if product_id:
+            vals['product_id'] = product_id
+        if description:
+            vals['description'] = description
+        return await self._o.create('hr.expense', vals)
+
+    async def attach_receipt(self, model: str, record_id: int, filename: str,
+                              file_b64: str, mimetype: str) -> bool:
+        try:
+            await self._o.create('ir.attachment', {
+                'name': filename,
+                'datas': file_b64,
+                'res_model': model,
+                'res_id': record_id,
+                'mimetype': mimetype,
+            })
+            return True
+        except Exception as exc:
+            logger.warning('attach_receipt failed %s/%s: %s', model, record_id, exc)
+            return False