[explorer/rest] feat: expose stored Symbol receipts through REST

[daoka]

How have you changed the behavior?

• Add /api/symbol/receipts for filtered receipt searches.
• Add /api/symbol/block/<height>/receipts for block receipts.
• Support limit/offset pagination with deterministic height DESC, id DESC ordering:
  • limit: 1–100, default 10.
  • offset: 0–100000, default 0.
• Validate supported parameters, repeated scalar parameters, type/group compatibility, and address checksums.
• Read sync state, block existence, receipts, and mosaic metadata within one REPEATABLE READ snapshot.
• Enforce synchronization and dirty/repairing visibility boundaries. Unsafe searches return 503 without removing dirty rows and shifting offsets.
• Return 404 for a missing readable block and an empty array for an existing block without receipts.
• Format native amounts using XYM divisibility 6. Use stored divisibility for non-native mosaics, falling back to base-unit amounts when metadata is absent.
• Exclude raw_payload from public responses.
• Share the 13 receipt type definitions between Puller and REST through common.symbol.ReceiptTypes.

This is an additive API change. Puller schema, ingestion, and rollback behavior remain unchanged.

Pagination does not guarantee a fixed snapshot across requests. The offset cap limits access to the first 100,100 matching rows; it does not provide complete history for every account.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.43%. Comparing base (8298563) to head (eb8ed00).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2580      +/-   ##
==========================================
+ Coverage   95.84%   97.43%   +1.58%     
==========================================
  Files         786      368     -418     
  Lines       60742    27148   -33594     
  Branches     1696      251    -1445     
==========================================
- Hits        58219    26451   -31768     
+ Misses       2455      690    -1765     
+ Partials       68        7      -61     

Flag	Coverage Δ
explorer-puller	100.00% <100.00%> (ø)
explorer-rest	?
wallet-mobile-symbol	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
explorer/common/symbol/ReceiptTypes.py	100.00% <100.00%> (ø)
explorer/puller/puller/db/SymbolDatabase.py	100.00% <100.00%> (ø)
explorer/puller/puller/facade/SymbolPuller.py	100.00% <100.00%> (ø)
explorer/puller/puller/model/symbol/Receipt.py	100.00% <100.00%> (ø)

... and 420 files with indirect coverage changes

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