feat(telegram): bot bonuri fiscale — OCR → preview → Oracle write

- US-001: mută queue_client.py în data_entry/services/ocr/
- US-002/003/004: oracle_receipt_writer + oracle_server_id în DB
- US-005: receipt_handlers.py (PDF/photo/callback flow)
- US-006: wire handlers în main.py, per-schema connect, seq_cod.nextval
- US-007: .gitignore secrets/*.oracle_pass
- US-008/009/010: teste unit + integration + E2E
- setup-secrets.sh helper + template
- docs/telegram/README.md actualizat cu arhitectura nouă

Testat E2E pe DB live (MARIUSM_AUTO). COD din seq_cod.nextval.
pypdfium2 fallback pentru PDF decode (fără poppler).

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

backend/migrations/env.py

@@ -0,0 +1,54 @@
+"""Alembic environment configuration for Telegram module (app.db)."""
+
+from logging.config import fileConfig
+from pathlib import Path
+
+from sqlalchemy import engine_from_config, pool
+from alembic import context
+
+config = context.config
+
+# Resolve DB path relative to this file: backend/migrations/env.py -> backend/data/app.db
+db_path = Path(__file__).parent.parent / "data" / "app.db"
+config.set_main_option("sqlalchemy.url", f"sqlite:///{db_path}")
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Raw SQL tables — no SQLModel metadata
+target_metadata = None
+
+
+def run_migrations_offline() -> None:
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=True,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()