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()

backend/migrations/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

backend/migrations/versions/20260505_add_oracle_server_id_to_telegram_users.py

@@ -0,0 +1,49 @@
+"""Add oracle_server_id to telegram_users
+
+Revision ID: 20260505_001
+Revises:
+Create Date: 2026-05-05
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import text
+
+# revision identifiers, used by Alembic.
+revision: str = '20260505_001'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+
+    # Fresh installs: init_app_db() creates telegram_users with oracle_server_id already included.
+    # This migration only needs to act on existing DBs that pre-date the column.
+    table_exists = conn.execute(
+        text("SELECT name FROM sqlite_master WHERE type='table' AND name='telegram_users'")
+    ).fetchone()
+    if not table_exists:
+        return
+
+    cols = [row[1] for row in conn.execute(text("PRAGMA table_info(telegram_users)")).fetchall()]
+    if 'oracle_server_id' not in cols:
+        with op.batch_alter_table('telegram_users') as batch_op:
+            batch_op.add_column(sa.Column('oracle_server_id', sa.Text(), nullable=True))
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    table_exists = conn.execute(
+        text("SELECT name FROM sqlite_master WHERE type='table' AND name='telegram_users'")
+    ).fetchone()
+    if not table_exists:
+        return
+
+    cols = [row[1] for row in conn.execute(text("PRAGMA table_info(telegram_users)")).fetchall()]
+    if 'oracle_server_id' in cols:
+        with op.batch_alter_table('telegram_users') as batch_op:
+            batch_op.drop_column('oracle_server_id')