Add PALKINTOSIJA aggregation table parity to public kokeet listing

[asku1990]

The old v1 KOKEET kalenterivuosittain page also contains a separate PALKINTOSIJA kpl(%) aggregation table. The current v2 public trials pages do not mirror this section.

Please inspect the old v1 implementation before changing anything:

• ../beagleAppV1/hallinta/ad_kokeetall.php
• any helper/query used to build the PALKINTOSIJA breakdown

What to verify in v1:

• The section title is P A L K I N T O S I J A kpl(%).
• The table is grouped by Koemuoto.
• Columns are 1, 2, 3, 0, L, S, Palk, and Yht.
• The rows include at least Yksipäiväinen and Kahden viikon.
• The values are percentages and totals derived from the old aggregation logic.

Implementation goal:

• Add this aggregation table to the v2 public kokeet listing if we want full parity with the old page.
• Keep the block separate from the per-trial row list and from the YHTEENVETO block.
• Reuse existing data structures or summary queries if possible.

Suggested acceptance criteria:

• The public listing renders a PALKINTOSIJA summary table.
• Grouping by Koemuoto matches the old v1 behavior.
• The result columns and totals are present and correctly labeled.
• Add/update tests for the aggregation output and any supporting data computation.