test: production ingest E2E test suite with enhanced logging (#55)

## Summary
Production testing of ingest + embedding pipeline with api-gw integration.

## Root Cause
9 SQL migrations in `crates/mem-store/migrations/` not applied to production database.

Missing tables:
- `memory_entity`
- `memory_edge`
- `memory_edge_temporal`
- Vector embeddings tables
- And 15+ more schema objects

Evidence from logs:
```
WARN: Failed to save entity Docker:
      error returned from database: relation "memory_entity" does not exist
```

## Deliverables
- `test_prod_ingest_real.sh` - Full E2E test against K8s + api-gw
- `apply_migrations.sh` - Manual schema migration (backup)
- `collect_prod_logs.sh` - Pod log collection before/after
- `run_production_test.sh` - Test orchestrator
- `tests/integration_ingest_with_gw.rs` - Integration test
- `tests/unit_ingest_logging.rs` - Unit tests for extraction
- Enhanced logging in `ingest_worker.rs` - Per-record event tracking

## Next Steps
1. Trigger "DB Migration" workflow in Forgejo Actions
2. This applies all 9 migrations from `crates/mem-store/migrations/`
3. Pod restart (automatic)
4. Re-run E2E test - should pass completely

**ETA:** ~15 minutes (3-5 min migrations + 2 min restart + verification)

## How to Test Locally
```bash
./test_prod_ingest_real.sh --verbose
```

Requires:
- kubectl access to poimen namespace
- Port-forwarding to memory-service

---------

Co-authored-by: rock <[email protected]>
Reviewed-on: #55
Co-authored-by: poimen <[email protected]>

Cargo.lock

@@ -2599,11 +2599,15 @@ dependencies = [
  "mem-llm",
  "mem-store",
  "regex",
+ "reqwest",
  "serde_json",
  "sqlx",
  "time",
  "tokio",
  "toml",
+ "tracing",
+ "tracing-subscriber",
+ "uuid",
  "wiremock",
 ]
 
@@ -3982,6 +3986,16 @@ dependencies = [
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-serde"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "704b1aeb7be0d0a84fc9828cae51dab5970fee5088f83d1dd7ee6f6246fc6ff1"
+dependencies = [
+ "serde",
+ "tracing-core",
+]
+
 [[package]]
 name = "tracing-subscriber"
 version = "0.3.23"
@@ -3989,11 +4003,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cb7f578e5945fb242538965c2d0b04418d38ec25c79d160cd279bf0731c8d319"
 dependencies = [
  "nu-ansi-term",
+ "serde",
+ "serde_json",
  "sharded-slab",
  "smallvec",
  "thread_local",
  "tracing-core",
  "tracing-log",
+ "tracing-serde",
 ]
 
 [[package]]