fix(data): resolve 364 smartphone brand-prefix conflicts (same-chip duplicates)

Follow-up to #329, which merged the 50 identical-core brand-prefix pairs and left
717 pairs that disagreed on a core field (soc / release_date / ram_gb / battery_mah
/ weight_g / os) documented but unresolved. This resolves the largest, highest-
confidence slice of those.

Classification of the 717 (scripted, then spot-verified against sources):
- The soc "conflict" in 572 pairs is two DIFFERENT slugs that both resolve to a
  real soc record. For 414 of those the two slugs are the SAME physical chip with
  a different spelling (e.g. "qualcomm-msm7227-snapdragon-s1" vs "qualcomm-msm7227",
  "qualcomm-msm8260a-snapdragon-s4-plus" vs "qualcomm-snapdragon-s4-msm8260a") — not
  a real spec difference.
- The other conflicts on those same-chip pairs are the fabricated import placeholders
  (weight_g=150.0, battery_mah=1500, and the generic YYYY-01-01 launch date) that
  #329 already flagged as a systemic bulk-import bug.

This commit merges the 364 same-chip pairs whose two sides are a GSMArena scrape
(bare slug, Kaggle `gsmarena-mobile-devices`, carries a `raw_gsmarena` block) and a
phonedb.net twin (brand-prefixed slug). Keeper = the GSMArena record:
- Its specs are the real ones. Spot-verified: Acer DX650 weighs 133 g
  (GSMArena, imei.org, softpedia) — the phonedb twin's 150.0 g is the stamped
  placeholder; Acer CloudMobile S500 is 122 g (GSMArena) vs phonedb's 150.0.
- soc kept as the keeper's slug (confirmed FK-valid for all 364; same physical chip).
- name upgraded to the brand-inclusive form ("Acer DX650" over "DX650").
- source_urls unioned so the phonedb.net reference is retained.
- verified left unchanged — NOT flipped to true, because the phonedb side's scalar
  values proved unreliable (fabricated weights), so it is not a trustworthy source.
- release_date left as the keeper's value and NOT resolved here: the phonedb twin's
  specific dates are unreliable too (phonedb says Acer DX650 = 2009-03 but
  GSMArena/imei say 2009-06), so importing them would be guessing. Dates are
  reported as still-unresolved rather than changed.
The redundant phonedb twin file is deleted. No scalar value was invented; in every
one of these 364 pairs the keeper already held the real GSMArena value and only the
deleted twin carried the placeholder.

Left for follow-up (documented on #296): 37 same-chip pairs sourced against vendor
/Wikipedia pages rather than phonedb, 157 pairs with a genuine ram/weight/battery
question needing per-record sourcing, and 158 pairs whose soc slugs are two
different chips — several of which are genuinely different devices that share a
name (e.g. Honor Magic V2 SD8Gen2 vs Kirin 9000S, Huawei P50 Pro SD888 vs Kirin
9000, HTC One M9 Helio X10 vs Snapdragon 810) and will be un-paired, not merged.

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

Closes #296

Author: Seungpyo1007

data/smartphone/acer/2009/acer-dx650.json

@@ -1,7 +1,7 @@
 {
   "slug": "dx650",
   "base_model_slug": "dx650",
-  "name": "DX650",
+  "name": "Acer DX650",
   "brand": "acer",
   "soc": "533-mhz-samsung-s3c-6410",
   "release_date": "2009-01-01",
@@ -11,7 +11,8 @@
   "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://phonedb.net/index.php?m=device&id=1745"
   ],
   "display": {
     "size_inch": 2.8,

data/smartphone/acer/2009/dx650.json

@@ -1,7 +1,7 @@
 {
   "slug": "betouch-e400",
   "base_model_slug": "betouch-e400",
-  "name": "beTouch E400",
+  "name": "Acer beTouch E400",
   "brand": "acer",
   "soc": "qualcomm-msm7227-snapdragon-s1",
   "release_date": "2010-01-01",
@@ -11,7 +11,8 @@
   "os": "Android",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://phonedb.net/index.php?m=device&id=2246"
   ],
   "display": {
     "size_inch": 3.2,

data/smartphone/acer/2010/acer-betouch-e400.json

@@ -1,7 +1,7 @@
 {
   "slug": "neotouch-p400",
   "base_model_slug": "neotouch-p400",
-  "name": "neoTouch P400",
+  "name": "Acer neoTouch P400",
   "brand": "acer",
   "soc": "qualcomm-msm7227-snapdragon-s1",
   "release_date": "2010-01-01",
@@ -11,7 +11,8 @@
   "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://phonedb.net/index.php?m=device&id=2236"
   ],
   "display": {
     "size_inch": 3.2,

data/smartphone/acer/2010/acer-neotouch-p400.json

@@ -1,7 +1,7 @@
 {
   "slug": "cloudmobile-s500",
   "base_model_slug": "cloudmobile-s500",
-  "name": "CloudMobile S500",
+  "name": "Acer CloudMobile S500",
   "brand": "acer",
   "soc": "qualcomm-msm8260a-snapdragon-s4-plus",
   "release_date": "2012-01-01",
@@ -11,7 +11,8 @@
   "os": "Android",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://phonedb.net/index.php?m=device&id=3407"
   ],
   "storage_options_gb": [
     1,

data/smartphone/acer/2010/betouch-e400.json

@@ -1,7 +1,7 @@
 {
   "slug": "liquid-glow-e330",
   "base_model_slug": "liquid-glow-e330",
-  "name": "Liquid Glow E330",
+  "name": "Acer Liquid Glow E330",
   "brand": "acer",
   "soc": "qualcomm-msm7227a-snapdragon-s1",
   "release_date": "2012-01-01",
@@ -11,7 +11,8 @@
   "os": "Android",
   "verified": false,
   "source_urls": [
-    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices"
+    "https://www.kaggle.com/datasets/msainani/gsmarena-mobile-devices",
+    "https://phonedb.net/index.php?m=device&id=3413"
   ],
   "storage_options_gb": [
     1