fix(data): merge 28 confirmed PDA near-duplicate records

Scanned the pda category (140 records, reviewed every match by hand) for the
three duplicate patterns the tablet/watch (#324) and smartphone (#329/#330)
passes turned up. Merged 28 redundant files into 21 keepers (140 -> 112),
keeping the better-sourced side field by field and unioning source_urls.

Pattern 1 - identical scrape imported twice under different row-id slugs
(100% identical specs, differ only by source_row):
  - motorola/2002/accompli-388: kept ...-scrapegsma-344, deleted ...-1227.
  - mitac/2005/mio-a701: kept ...-scrapegsma-278, deleted ...-1161.

Pattern 2 - same device under a brand-prefixed slug and a bare slug in sibling
dirs. Same convention as the #330 GSMArena/phonedb merge: kept the bare
GSMArena/Kaggle record (real specs + raw_gsmarena, sometimes Wikipedia),
upgraded name to the brand-inclusive form, unioned source_urls to retain the
phonedb reference, kept the keeper's soc/release_date, left verified as-is,
deleted the phonedb twin:
  - treo-680  <- palm-treo-680-palm-lowrider   ("Palm Treo 680")
  - treo-750v <- palm-treo-750v-htc-cheetah    ("Palm Treo 750v")
  - treo-750  <- palm-treo-750-htc-cheetah     ("Palm Treo 750")
  - treo-500v <- palm-treo-500v-palm-otto      ("Palm Treo 500v")
Treo 750 vs 750v and Treo 500 vs 500v were kept as distinct SKUs (only the
matching-model twins were merged). palm-treo-500-palm-otto (2008 Treo 500) is a
different device and was left alone.

Pattern 3 - cross-source duplicate: the same PDA imported as a clean short-slug
record and as a cigarplug/scrape-gsma row in the same base dir. Kept the clean
record (correct soc FK, canonical slug), deleted the scrape twin, and repaired
the keeper's ram_gb from the twin's cited memory_internal (the clean side
carried the fabricated ram_gb=1 placeholder; the scrape side had the real
value). The github.com/cigarplug/scrape-gsma URL was unioned so the repaired
RAM is sourced:
  - 16 HP iPAQ pairs: h6310/h6315/h6320/h6325/hw6510/hw6515 -> 0.0625 GB (64 MB);
    hw6910/hw6915/rw6815/rw6818/rw6828/514 -> 0.0625; 610c/910c/data-messenger/
    voice-messenger -> 0.125 GB (128 MB).
  - i-mate pda2 (two identical scrape twins, -1004 and -121) -> 0.125 GB.
  - i-mate pda2k -> 0.125 GB; i-mate pdal -> 0.062 GB.
  - palm treo-pro (3-way: bare + scrape-gsma-7066 + phonedb palm-treo-pro):
    kept the bare Wikipedia-cited record, ram 1 -> 0.125 GB (128 MB), name ->
    "Palm Treo Pro", unioned all four source_urls.

Left unmerged and documented (ambiguous, per "leave ambiguous unmerged"): the
GSM webOS palm-pre-scrapegsma-7065 and palm-pre-plus-scrapegsma-7063 overlap a
region-split family (palm-pre[-plus]-palm-castle-c CDMA and
palm-pre[-plus]-gsm-*-palm-castle-g EU/NA) but do not map 1:1, so no merge.
The EU/NA regional variant pairs (pixi-gsm, pixi-plus-gsm, pre-2-gsm,
pre[-plus]-gsm-castle-g) are legitimate separate SKUs and were left alone.

No value was invented: every ram_gb repair took the real figure already present
in the deleted twin's cited memory_internal. verified flags unchanged.

Both gates pass: `python -m app.validate` and `integrity_check.py <data>
--strict` (0 hard anomalies).

Refs #296

Author: Seungpyo1007

data/pda/hp/2004/ipaq-h6310/hp-ipaq-h6310-scrapegsma-3824.json

@@ -4,13 +4,14 @@
   "brand": "hp",
   "soc": "ti-omap-1510",
   "release_date": "2004-01-01",
-  "ram_gb": 1,
+  "ram_gb": 0.0625,
   "battery_mah": 1800,
   "weight_g": 190.0,
   "os": "Windows Mobile",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://github.com/cigarplug/scrape-gsma"
   ],
   "display": {
     "size_inch": 3.5,

data/pda/hp/2004/ipaq-h6310/ipaq-h6310.json

@@ -4,13 +4,14 @@
   "brand": "hp",
   "soc": "ti-omap-1510",
   "release_date": "2004-01-01",
-  "ram_gb": 1,
+  "ram_gb": 0.0625,
   "battery_mah": 1800,
   "weight_g": 190.0,
   "os": "Windows Mobile",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://github.com/cigarplug/scrape-gsma"
   ],
   "display": {
     "size_inch": 3.5,

data/pda/hp/2004/ipaq-h6315/hp-ipaq-h6315-scrapegsma-3823.json

@@ -4,13 +4,14 @@
   "brand": "hp",
   "soc": "ti-omap-1510",
   "release_date": "2004-01-01",
-  "ram_gb": 1,
+  "ram_gb": 0.0625,
   "battery_mah": 1800,
   "weight_g": 190.0,
   "os": "Windows Mobile",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://github.com/cigarplug/scrape-gsma"
   ],
   "display": {
     "size_inch": 3.5,

data/pda/hp/2004/ipaq-h6315/ipaq-h6315.json

@@ -4,13 +4,14 @@
   "brand": "hp",
   "soc": "ti-omap-1510",
   "release_date": "2004-01-01",
-  "ram_gb": 1,
+  "ram_gb": 0.0625,
   "battery_mah": 1800,
   "weight_g": 190.0,
   "os": "Windows Mobile",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://github.com/cigarplug/scrape-gsma"
   ],
   "display": {
     "size_inch": 3.5,

data/pda/hp/2004/ipaq-h6320/hp-ipaq-h6320-scrapegsma-3822.json

@@ -4,13 +4,14 @@
   "brand": "hp",
   "soc": "intel-pxa270-312-mhz",
   "release_date": "2005-01-01",
-  "ram_gb": 1,
+  "ram_gb": 0.0625,
   "battery_mah": 1200,
   "weight_g": 165.0,
   "os": "Windows Mobile",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://github.com/cigarplug/scrape-gsma"
   ],
   "display": {
     "size_inch": 3.0,